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Question

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

679 680 690 691 701 702 712 ?

This question was previously asked in
RRB NTPC 2024 CBT 1 Question Paper (28-Aug-2025) (Shift 3)
The correct answer is
713

Series Pattern Analysis

To find the missing number in the series 679, 680, 690, 691, 701, 702, 712, ?, we need to identify the pattern.

Analyzing the Series Progression

  • The difference between the first two numbers is $680 - 679 = 1$.
  • The difference between the second and third numbers is $690 - 680 = 10$.
  • The difference between the third and fourth numbers is $691 - 690 = 1$.
  • The difference between the fourth and fifth numbers is $701 - 691 = 10$.
  • The difference between the fifth and sixth numbers is $702 - 701 = 1$.
  • The difference between the sixth and seventh numbers is $712 - 702 = 10$.

Identifying the Pattern

The series follows a repeating pattern of adding 1, then adding 10.

Pattern: +1, +10, +1, +10, +1, +10, ...

Calculating the Missing Term

The last operation was adding 10 (from 702 to 712). Therefore, the next operation in the pattern is to add 1.

The missing number is $712 + 1 = 713$.

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