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Question

What should come in place of the question mark (?) in the given series?

112 101 90 79 68 ?

This question was previously asked in
RRB NTPC 2024 CBT 1 Question Paper (28-Aug-2025) (Shift 3)
The correct answer is
57

Series Pattern Analysis

To find the missing term in the series 112, 101, 90, 79, 68, ?, we need to identify the pattern between consecutive numbers.

  • Calculate the difference between the first two terms: $112 - 101 = 11$
  • Calculate the difference between the second and third terms: $101 - 90 = 11$
  • Calculate the difference between the third and fourth terms: $90 - 79 = 11$
  • Calculate the difference between the fourth and fifth terms: $79 - 68 = 11$

Identifying the Pattern

The pattern observed is that each term is obtained by subtracting 11 from the previous term. This is an arithmetic sequence with a common difference of -11.

Calculating the Missing Term

To find the term that should replace the question mark (?), we subtract 11 from the last given term (68):

$68 - 11 = 57$

Therefore, the number 57 should come in place of the question mark.

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Important Questions from Number Series

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