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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 (8-Mar-2021) (Shift 2)
The correct answer is
18

To find the correct number that replaces the question mark in the pattern, let's analyze the sets of numbers given in each row.

Consider the numbers in each row and observe any pattern or relationship:

  1. The first row contains numbers: 15, 9, 5, 3.
  2. The second row contains numbers: 12, 6, 4, 2.
  3. The third row contains numbers: 2, 4, 9, ?. We need to find the missing number here.

Look for a relationship between the numbers in each row:

  • For the first row: The pattern from 15 to 3 can be seen as a sequence of subtractions: \(15 - 6 = 9, \ 9 - 4 = 5, \ 5 - 2 = 3\).
  • For the second row: Similarly, the sequence is as follows: \(12 - 6 = 6, \ 6 - 2 = 4, \ 4 - 2 = 2\).
  • Applying this pattern to the third row: \(2, \ 4, \ 9\ (missing) = (9 + 9 - 4 - 2).\)

Since the same subtraction (six) seems to be repeated as demonstrated in previous sequences, let's calculate:

  • Apply the subtraction pattern to the current known numbers in the sequence: \(9 + 9 - 4 - 2 = 18\).

Thus, the missing number should be 18. Therefore, the number 18 is the correct answer.

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