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Question

What should come in place of the question mark (?) in the given series?
108 103 97 90 82 73 ?

This question was previously asked in
RRB ALP 2025 CBT 2 Wiremen Question Paper (28-Jul-2026) (Shift 2)
The correct answer is
63

Series Pattern Analysis

The given number series is: 108, 103, 97, 90, 82, 73, ?

Let's find the difference between consecutive terms:

  • \(108 - 103 = 5\)
  • \(103 - 97 = 6\)
  • \(97 - 90 = 7\)
  • \(90 - 82 = 8\)
  • \(82 - 73 = 9\)

The differences are increasing by 1 each time (\(5, 6, 7, 8, 9\)).

Finding the Missing Term

Following the established pattern, the next difference should be \(10\).

Therefore, the missing term is calculated by subtracting \(10\) from the last term (\(73\)):

\(73 - 10 = 63\)

The number that should come in place of the question mark is 63.

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Important Questions from Number Series

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