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Question

Study the given pattern carefully and select the number that can replace the question mark (?) in it.
3?4
71218
695

This question was previously asked in
RRB NTPC 2019 CBT 1 Question Paper (8-Mar-2021) (Shift 2)
The correct answer is
9

The given sequence of numbers forms a 3x3 grid:

3 ? 4
7 12 18
6 9 5

Finding the Pattern

The pattern observed relates the sum of the elements in the first row to the sum of the elements in the first column.

  • Sum of the first row = $3 + ? + 4$
  • Sum of the first column = $3 + 7 + 6$

Calculation

According to the pattern, the sum of the first row must equal the sum of the first column:

$3 + ? + 4 = 3 + 7 + 6$

Combine the known numbers:

$7 + ? = 16$

Solve for the question mark (?):

$? = 16 - 7$

$? = 9$

Conclusion

Therefore, the number that can replace the question mark is 9.

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