Mathematical Reasoning - Number Series

31. Find the missing number in the following series.
10, 24, 52, ?, 220, 44, 892

  • Option : D
  • Explanation : 10 × 2 + 4 = 24;
    24 × 2 + 4 = 52;
    52 × 2 + 4 = 108;
    and so on.
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32. Which of the following will not be a number of the series
1, 8, 27, 64, 125,?

  • Option : A
  • Explanation : The given series consists of cubes of natural numbers only. The number 256 is not the cube of any natural number.
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33. Find the missing number in the following series.
13, 32, 24, 43, 35, ?, 46, 65, 57, 76

  • Option : C
  • Explanation : The given sequence is a combination of two series.
    Ist Series: 13, 24, 35, 46 and 57
    IInd Series: 32, 43, ?, 65 and 76
    The pattern in both series is + 11. Hence, the missing term = 43 + 11 = 54.
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34. Find the missing number in the following series.
23, 33, 46, 62, 81, 103,?

  • Option : D
  • Explanation : 23 + 10 = 33, 33 + 13 = 46, 46 + 16 = 62 and so on
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35. Find the wrong number in this sequence.
10, 26, 74, 218, 654, 1,946

  • Option : D
  • Explanation : 10 × 3 − 4 = 26
    26 × 3 − 4 = 74
    74 × 3 − 4 = 218
    218 × 3 − 4 = 650
    650 × 3 − 4 = 1946
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