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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 (?).

This question was previously asked in
RRB NTPC 2019 CBT 1 Question Paper PDF (31-Jan-2021) (Shift 1)
The correct answer is
20

To find the missing number in the pattern, let's analyze the given figures:

Observe the patterns in each set of numbers:

  1. In the first set:
    • 16 (left) : 17 (center) : 14 (right)
    • The sum of the left and right numbers: \( 16 + 14 = 30 \)
    • The center number: \( 17 = 30 - 13 \)
    • Hence, the bottom number (13) is the difference between 30 and the center (17).
  2. In the second set:
    • 17 (left) : 12 (center) : 4 (right)
    • The sum of the left and right numbers: \( 17 + 4 = 21 \)
    • The center number: \( 12 = 21 - 9 \)
    • Hence, the bottom number (9) is the difference between 21 and the center (12).
  3. In the third set:
    • 29 (left) : 32 (center) : ? (right)
    • The sum of the left and right numbers should equal the center plus the bottom number.

Let's apply the same pattern to find the missing number:

  • The center number is 32, and the left number is 29. Let the right number be \( x \).
  • The sum of the left and right numbers: \( 29 + x = 32 + 17 \)
  • \( 29 + x = 49 \)
  • Solving for \( x \): \( x = 49 - 29 = 20 \)

Therefore, the missing number is 20, which matches the given correct answer option.

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Important Questions from Missing Number

  1. Find the missing number from the below options.

  2. Find the missing number from the below options.

  3. Find the missing number from the below options.

  4. In the following question, select the number which can be placed at the sign of question mark (?) from the given alternatives

    12

    17

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    21

    81

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    45

    ?

  5. In the following question, find the missing number from the given series.

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