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Number series Test 1
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Number series Test 1
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  • Question 1/10
    1 / -0

    Which number will come next in the following series

    3, 12, 27, 48, 75, 108, ..?..

    Solutions

    The numbers are 3 × 1², 3 × 2², 3 × 3², 3 × 4², 3 × 5², 3 × 6², ……
    ∴ Missing number = 3 × 7² = 3 × 49 = 147

  • Question 2/10
    1 / -0

    Which number will come next in the following series

    8,15,28,53, ..?..

    Solutions

    8 × 2 – 1 = 15,
    15 × 2 – 2 = 28,
    28 × 2 – 3 = 53,
    53 × 2 – 4 =102

  • Question 3/10
    1 / -0

    Which number will come next in the following set of numbers?

    2, 5, 7, 12, 15, 17, 22 ..?..

    Solutions

    2+3 = 5, 5+2 = 7, 7+5 = 12, 12+3 = 15, 15+2 = 17, 17+5 = 22.
    Note that 3,2,5 are being added that order to various numbers to get the next number. Therefore, 3 should be added to 22 to get the answer.

  • Question 4/10
    1 / -0

    Which number will come next in the following set of numbers

    3, 13, 53, 213 ..?..

    Solutions

    The difference in consecutive numbers follows the sequence, 10, 40, 160.
    So the next difference = 160 × 4 = 640
    Therefore number = 213 + 640 = 853.

  • Question 5/10
    1 / -0

    What number will come next in the following series?

    2, 12, 36, 80, 150, ..?..

    Solutions

    1³ + 1² = 2, 2³ + 2² = 12, 3³ + 3² = 36 and so on
    ∴ 6³ + 6² = 252

  • Question 6/10
    1 / -0

    What number will come next in the following series?

    2, 2, 4, 4, 6, 8, 8, ..?..

    Solutions

    The given series consists of 2 series
    (i) 2, 4, 6, 8 ………….
    (ii) 2, 4, 8 ………….
    Series (i) → 2× 1, 2 × 2, 2 × 3 , 2 × 4 …….
    Series (ii) → 2, 2× 2, 4 × 2, 8 × 2 = 16 …….

  • Question 7/10
    1 / -0

    Which one of the numbers will complete the series ?

    6.25, 9, 12.25, 16, 20.25, 25, 30.25, ..?..

    Solutions

    There are two alternate series
    Series I: 6.25, 12.25, 20.25, 30.25 (sequence is +6, +8, +10)
    Series II: 9, 16, 25, 36, (sequence is +7, +9, +11)

  • Question 8/10
    1 / -0

    Which one of the numbers will complete the series ?

    8, 13, 10, 15, 12, 17, 14 ..?..

    Solutions

    Second term is greater than first term by 5, while the third term is less than the second term by 3. The same order is repeated.

  • Question 9/10
    1 / -0

    Which is the number that comes next in this sequence?

    5, 16, 51, 158, ..?..

    Solutions

    16 = 5 × 3 + 1, 51 = 16 × 3 + 3, 158 = 51 × 3 + 5
    ∴ Next term = 158 × 3 + 7 = 481

  • Question 10/10
    1 / -0

    What is the next number in this sequence ?

    1, 3, 8, 19, 42, 89, ..?..

    Solutions

    Each of the numbers is doubled and 1, 2, 3, 4, 5, 6 is added in next term,
    so, 89 × 2 + 6 = 184.

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