Find the next number in this series.

56, 54, 51, 46, 39, ?

This question was previously asked in
RPF Constable (2018) Official Paper (Held On 03 Feb 2019)
View all RPF Constable Papers >
  1. 28
  2. 36
  3. 30
  4. 40

Answer (Detailed Solution Below)

Option 1 : 28
Free
RPF Constable Full Test 1
120 Qs. 120 Marks 90 Mins

Detailed Solution

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The logic here followed is 

The series is decreasing by 2, then by 3, then by 5, then by 7, and so on. The differences between the numbers are 2, 3, 5, 7, 11, and so on (prime numbers). Therefore, the next number in the series should be 39 - 11 = 28.

Hence, the correct answer is "Option 1".

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