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Number Series Test - 7
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Number Series Test - 7
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  • Question 1/30
    3 / -1

    Directions to Solve

    In this type of questions, one term in the number series is wrong. Find out the wrong term.

    Question -

    6, 15, 35, 77, 165, 221

    Solutions

    The terms of the series are products of two consecutive prime numbers i.e. (2 x 3),

    (3 x 5), (5 x 7), (7 x 11),.....

    So, 165 is wrong and must be replaced by (11 x 13) i.e. 143.

  • Question 2/30
    3 / -1

    Directions to Solve

    In this type of questions, one term in the number series is wrong. Find out the wrong term.

    Question -

    121, 143, 165, 186, 209

    Solutions

    Each term in the series is obtained by adding 22 to the preceding term.

    So, 186 is wrong and must be replaced by (165 + 22) i.e. 187.

  • Question 3/30
    3 / -1

    Directions to Solve

    In this type of questions, one term in the number series is wrong. Find out the wrong term.

    Question -

    8, 13, 21, 32, 47, 63, 83

    Solutions

    The correct pattern is + 5, + 8, + 11, + 14,.....

    So, 47 is wrong and must be replaced by (32 + 14) i.e. 46.

  • Question 4/30
    3 / -1

    Directions to Solve

    In this type of questions, one term in the number series is wrong. Find out the wrong term.

    Question -

    3, 4, 10, 32, 136, 685, 4116

    Solutions

    The correct pattern is x 1 + 1, x 2 + 2, x 3 + 3, x 4 + 4,.....

    So, 32 is wrong and must be replaced by (10 x 3 + 3) i.e. 33.

  • Question 5/30
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    Directions to Solve

    In this type of questions, one term in the number series is wrong. Find out the wrong term.

    Question -

    1, 2, 4, 8, 16, 32, 64, 96

    Solutions

    Each term of the series is obtained by multiplying the preceding term by 2.

    So, 96 is wrong and must be replaced by (64 x 2) i.e. 128.

  • Question 6/30
    3 / -1

    Directions to Solve

    In this type of questions, one term in the number series is wrong. Find out the wrong term.

    Question -

    105, 85, 60, 30, 0, - 45, - 90

    Solutions

    The correct pattern is - 20, - 25, - 30,.....

    So, 0 is wrong and must be replaced by (30 - 35) i.e. - 5.

  • Question 7/30
    3 / -1

    Directions to Solve

    In this type of questions, one term in the number series is wrong. Find out the wrong term.

    Question -

    2, 5, 10, 17, 26, 37, 50, 64

    Solutions

    The terms of the series are (12 + 1), (22 + 1), (32 + 1), (42 + 1), (52 + 1), (62 + 1),

    (72+1),.....

    So, 64 is wrong and must be replaced by (82 + 1) i.e. 65.

  • Question 8/30
    3 / -1

    Directions to Solve

    In this type of questions, one term in the number series is wrong. Find out the wrong term.

    Question -

    125, 126, 124, 127, 123, 129

    Solutions

    The correct pattern is + 1, - 2, + 3, - 4, + 5.

    So, 129 is wrong and must be replaced by (123 + 5) i.e. 128.

  • Question 9/30
    3 / -1

    Directions to Solve

    In this type of questions, one term in the number series is wrong. Find out the wrong term.

    Question -

    1,3,12,25,48

    Solutions

    The terms of the series are (l2 - 02), (22 - l2), (42 - 22), (62 - 32) and (82 - 42).

    So, 25 is wrong and must be replaced by (62 - 32) i.e. 27.

  • Question 10/30
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    Directions to Solve

    In this type of questions, one term in the number series is wrong. Find out the wrong term.

    Question -

    2, 5, 10, 50, 500, 5000

    Solutions

    Each term of the series is the product of the preceding two terms.

    So, 5000 is wrong and must be replaced by (50 x 500) i.e. 25000.

  • Question 11/30
    3 / -1

    Directions to Solve

    In this type of questions, one term in the number series is wrong. Find out the wrong term.

    Question -

    15, 16, 22, 29, 45, 70

    Solutions

    The correct pattern is + 1, + 4, + 9, + 16, + 25 i.e. + 12, + 22, + 32, + 42, + 52.

    So, 22 is wrong and must be replaced by (16 + 4) i.e. 20.

  • Question 12/30
    3 / -1

    Directions to Solve

    In this type of questions, one term in the number series is wrong. Find out the wrong term.

    Question -

    8, 14, 26, 48, 98, 194, 386

    Solutions

    The correct pattern is x 2 - 2.

    So, 48 is wrong and must be replaced by (26 x 2 - 2) i.e. 50.

  • Question 13/30
    3 / -1

    Directions to Solve

    In this type of questions, one term in the number series is wrong. Find out the wrong term.

    Question -

    3, 10, 27, 4, 16, 64, 5, 25, 125

    Solutions

    The correct sequence is 3, 32, 33, 4, 42, 43, 5, 52, 53.

    So, 10 is wrong and must be replaced by 32 i.e. 9.

  • Question 14/30
    3 / -1

    Directions to Solve

    In this type of questions, one term in the number series is wrong. Find out the wrong term.

    Question -

    4, 10, 22, 46, 96, 190, 382

    Solutions

    The correct pattern is + 6, + 12, + 24, + 48, + 96, + 192.

    So, 96 is wrong and must be replaced by (46 + 48) i.e. 94.

  • Question 15/30
    3 / -1

    Directions to Solve

    In this type of questions, one term in the number series is wrong. Find out the wrong term.

    Question -

    1, 5, 9, 15, 25, 37, 49

    Solutions

    The terms of the given series are 12, (22 + 1), 32, (42..+ 1), 52, (62 + 1), 72.

    So, 15 is wrong and must be replaced by (42 + 1) i.e. 17.

  • Question 16/30
    3 / -1

    Directions to Solve

    In this type of questions, one term in the number series is wrong. Find out the wrong term.

    Question -

    2, 6, 24, 96, 285, 568, 567

    Solutions

    The correct pattern is x 6 - 6, x 5 - 5, x 4 - 4,.....

    So, 24 is wrong and must be replaced by (6 x 5 - 5) i.e. 25.

  • Question 17/30
    3 / -1

    Directions to Solve

    In this type of questions, one term in the number series is wrong. Find out the wrong term.

    Question -

    3, 2, 8, 9, 13, 22, 18, 32, 23, 42

    Solutions

    The given sequence is a combination of two series:

    I. 3, 8, 13, 18, 23 and II. 2, 9, 22, 32, 42

    The pattern in I is + 5, and the pattern in II is + 10. So, in II, 9 is wrong and must be replaced by (2 + 10) i.e. 12.

  • Question 18/30
    3 / -1

    Directions to Solve

    In this type of questions, one term in the number series is wrong. Find out the wrong term.

    Question -

    196, 169, 144, 121, 101

    Solutions

    The sequence is (14)2, (13)2, (12)2, (11)2, (10)2.

    So, 101 is wrong and must be replaced by (10)2 i.e. 100.

  • Question 19/30
    3 / -1

    Directions to Solve

    In this type of questions, one term in the number series is wrong. Find out the wrong term.

    Question -

    56, 58, 62, 70, 84, 118, 182

    Solutions

    The correct pattern is + 2, + 4, + 8, + 16, + 32, + 64 i.e. + 2, + 22, + 23, + 24, + 25, + 26.

    So, 84 is wrong and must be replaced by (70 + 16) i.e. 86.

  • Question 20/30
    3 / -1

    Directions to Solve

    In this type of questions, one term in the number series is wrong. Find out the wrong term.

    Question -

    1, 5, 5, 9, 7, 11, 11, 15, 12, 17

    Solutions

    The given sequence is a combination of two series:

    I. 1, 5, 7, 11, 12 and II. 5, 9, 11, 15, 17

    The pattern in both I and II is + 4, + 2, + 4, + 2. So, 12 is wrong and must be replaced by (11 + 2) i.e. 13.

  • Question 21/30
    3 / -1

    Directions to Solve

    In this type of questions, one term in the number series is wrong. Find out the wrong term.

    Question -

    25, 36, 49, 81, 121, 169, 225

    Solutions

    The correct sequence is 52, 72, 92, 112, 132, 152. So, 36 is wrong.

  • Question 22/30
    3 / -1

    Directions to Solve

    In this type of questions, one term in the number series is wrong. Find out the wrong term.

    Question -

    1, 3, 10, 21, 64, 129, 356, 777

    Solutions

    The correct pattern is x 2 + 1, x 3 + 1, x 2 + 1, x 3 + 1,.....

    So, 356 is wrong and must be replaced by (129 x 3 + 1) i.e. 388.

  • Question 23/30
    3 / -1

    Directions to Solve

    In this type of questions, one term in the number series is wrong. Find out the wrong term.

    Question -

    5, 10, 40, 80, 320, 550, 2560

    Solutions

    The correct pattern is x 2, x 4, x 2, x 4, .....

    So, 550 is wrong and must be replaced by (320 x 2) i.e. 640.

  • Question 24/30
    3 / -1

    Directions to Solve

    In this type of questions, one term in the number series is wrong. Find out the wrong term.

    Question -

    2, 3, 4, 4, 6, 8, 9, 12, 16

    Solutions

    The given sequence is a combination of three series:

    I. 1st, 4th, 7th terms i.e. 2, 4, 9,.....

    II. 2nd, 5th, 8th terms i.e. 3, 6, 12,.....

    III. 3rd, 6th, 9th terms i.e. 4, 8, 16,.....

    In each one of I, II and III, each term is twice the preceding term. So, 9 is wrong and must be replaced by (4 x 2) i.e. 8.

  • Question 25/30
    3 / -1

    Directions to Solve

    In this type of questions, one term in the number series is wrong. Find out the wrong term.

    Question -

    11, 5, 20, 12, 40, 26, 74, 54

    Solutions

    The given sequence is a combination of two series :

    I. 11, 20, 40, 74 and II. 5, 12, 26, 54

    The correct pattern in I is + 9, + 18, + 36,.....

    So, 40 is wrong and must be replaced by (20 + 18) i.e. 38.

  • Question 26/30
    3 / -1

    Directions to Solve

    In this type of questions, one term in the number series is wrong. Find out the wrong term.

    Question -

    5, 27, 61, 122, 213, 340, 509

    Solutions

    The terms of the series are (23 - 3), (33 - 3), (43 - 3), (53 - 3), (63 - 3), (73 - 3),

    (83-3).

    So, 27 is wrong and must be replaced (33 - 3) i.e. 24.

  • Question 27/30
    3 / -1

    Directions to Solve

    In this type of questions, one term in the number series is wrong. Find out the wrong term.

    Question -

    3, 7, 15, 39, 63, 127, 255, 511

    Solutions

    The correct pattern is x 2 + 1.

    So, 39 is wrong and must be replaced by (15 x 2 + 1) i.e. 31.

  • Question 28/30
    3 / -1

    Directions to Solve

    In this type of questions, one term in the number series is wrong. Find out the wrong term.

    Question -

    380, 188, 92, 48, 20, 8, 2

    Solutions

    The correct pattern is - 192, - 96, - 48, - 24, - 12, - 6.

    So, 48 is wrong and must be replaced by (92 - 48) i.e. 44.

  • Question 29/30
    3 / -1

    Directions to Solve

    In this type of questions, one term in the number series is wrong. Find out the wrong term.

    Question -

    16, 22, 30, 45, 52, 66

    Solutions

    The correct pattern is + 6, + 8, + 10, + 12, + 14.

    So, 45 is wrong and must be replaced by (30 + 10) i.e. 40.

  • Question 30/30
    3 / -1

    Directions to Solve

    In this type of questions, one term in the number series is wrong. Find out the wrong term.

    Question -

    10, 26, 74, 218, 654, 1946, 5834

    Solutions

    The correct pattern is x 3 - 4.

    So, 654 is wrong and must be replaced by (218 x 3 - 4) i.e. 650.

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