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Question

Study the given pattern carefully and select the number from among the given options that can replace the question mark (?) in it. 

This question was previously asked in
RRB NTPC 2019 CBT 1 Question Paper PDF (31-Jan-2021) (Shift 1)
The correct answer is
77

To solve the given pattern and find the number that replaces the question mark, we need to understand the logic used in the numbers surrounding the central one.

Looking at the pattern in the first diagram:

We have:

  • The numbers 6 and 9 on the left and bottom of 117.
  • The numbers 7 and 9 on the top and right of 117.

Notice the following:

  • If we consider the operation: \(6 \times 9 + 7 \times 9\), it gives: \(6 \times 9 + 7 \times 9 = 54 + 63 = 117\). This matches the middle number.

Now let's apply this pattern to the second set of numbers:

  • The numbers are 7 and 7 on the left and right.
  • The numbers are 9 and 2 on the top and bottom.

Applying the same logic:

  • Calculate: \(7 \times 9 + 7 \times 2\)
  • \(7 \times 9 + 7 \times 2 = 63 + 14 = 77\)

Thus, the number that replaces the question mark is 77.

This explains that the correct answer is 77.

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Important Questions from Missing Number

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