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Number Series Test - 1
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Number Series Test - 1
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  • Question 1/10
    3 / -1

    Look at this series: 4, 6, 12, 30, 90,  ?, 1260. What number should come?

    Solutions

    Logic is:

    ► 4 × 1.5 = 6,
    ► 6 × 2 = 12,
    ► 12 × 2.5 = 30,
    ► 30 × 3 = 90,
    ► 90 × 3.5 = 315,
    ► 315 × 4 = 1260. 

  • Question 2/10
    3 / -1

    Look at this series: 7, 10, 8, 11, 9, 12,...so on. What number should come next?

    Solutions

    This is a simple alternating addition and subtraction series.

    In the first pattern, 3 is added. In the second, 2 is subtracted.

    ► 7 + 3 = 10,
    ► 10 - 2 = 8,
    ► 8 + 3 = 11,
    ► 11 - 2 = 9,
    ► 9 + 3 = 12,
    ► 12 - 2 = 10.

  • Question 3/10
    3 / -1

    Look at this series: 6, 12, 48, 264,1560...so on. What number should come next?

    Solutions

  • Question 4/10
    3 / -1

    Look at this series: 3, 4, 7, 8, 11, 12,...so on. What number should come next?

    Solutions

    This alternating addition series begins with 3.
    ► Then 1 is added to give 4,
    ► Then 3 is added to give 7,
    ► Then 1 is added to give 8,
    ► Then 3 is added to give 11,
    ► Then 1 is added to give 12,
    ► Then 3 is added to give 15.

  • Question 5/10
    3 / -1

    Look at this series: 4, 11, 19, 41, ?, 161...so on. What number should come?

    Solutions

    Pattern:

    ► 4 × 2 + 3 = 11,
    ► 11 × 2 – 3 = 19,
    ► 19 × 2 + 3 = 41,
    ► 41 × 2 – 3 = 79,
    ► 79 × 2 + 3 = 161.

  • Question 6/10
    3 / -1

    Look at this series: 53, 53, 40, 40, 27, 27,...so on. What number should come next?

    Solutions

    A number is repeated. Then it is reduced by 13 and the result is repeated.

    ► The next number is 27-13=14.

  • Question 7/10
    3 / -1

    Look at this series: 8, 22, 8, 28, 8,...so on. What number should come next?

    Solutions

    This is a simple addition series with a random number, 8, interpolated as every other number.

    In the series, 6 is added to each number except 8, to arrive at the next number.

    ► 22 + 6 = 28,
    ► 28 + 6 = 34.

  • Question 8/10
    3 / -1

    Look at this series: 1, 3, 6, 10, 15...so on. What number should come next?

    Solutions

    It is a triangular number series forming a triangular pattern.

    ► 1 = 1,
    ► 1+2 = 3,
    ► 1+2+3 = 6,
    ► 1+2+3+4 = 10,
    ► 1+2+3+4+5 = 15,
    ► 1+2+3+4+5+6 = 21.

  • Question 9/10
    3 / -1

    Look at this series: 2, 1, (1/2), (1/4),...so on. What number should come next?

    Solutions

    This is a simple division series, each number is one-half of the previous number.

    In other terms to say, the number is divided by 2 successively to get the next result.

    ► 4/2 = 2
    ► 2/2 = 1
    ► 1/2 = 1/2
    ► (1/2) / 2 = 1/4
    ► (1/4) / 2 = 1/8 and so on.

  • Question 10/10
    3 / -1

    3, 9, 24, 57, ?, 267, 552. What number should come? 

    Solutions

     

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