Mathematical Reasoning - Number Series

16. Find the missing number in the following series.
512, 256, 128, ?, 32, 16, 8

  • Option : C
  • Explanation : Each number is half of its preceding number.
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17. Find the missing number in the following series.
2, 7, 17, 32, 52, 77,?

  • Option : A
  • Explanation : +5, +10, +15, +20, +25, +30
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18. Find the missing number in the following series.
15, 18, 24, ?, 45

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19. Fill in the missing number in the following arrangement based on some principle.

864
3?7
141618

  • Option : B
  • Explanation : In first row, it is −2; in second row, it is +2, and in third row, it is +2.
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20. Find the missing number in the following series.
8, 24, 12, ?, 18, 54

  • Option : C
  • Explanation : Multiply the first by 3 and divide the number so obtained by 2. This is to be done alternatively for all other numbers
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