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Two sets of numbers are given below. In each set of numbers, certain mathematical operation(s) on the first number results in the second number. Similarly, certain mathematical operation(s) on the second number results in the third number and so on. Which of the given options follows the same set of operations as in the given sets? (NOTE: Operations should be performed on the whole numbers, without breaking down the numbers into their constituent digits. E.g. 13 – Operations on 13 such as adding/subtracting/multiplying to 13 can be performed. Breaking down 13 into 1 and 3 and then performing mathematical operations on 1 and 3 is not allowed.) 68 – 136 – 121 – 363; 29 – 58 – 43 – 129

This question was previously asked in
RRB NTPC 2024 Undergraduate CBT 1 Question Paper (29-Aug-2025) (Shift 1)
The correct answer is

35 – 70 – 55 – 165

Let's analyze the given number sets to identify the pattern:

  • Set 1: 68 – 136 – 121 – 363
  • 68 x 2 = 136
  • 136 - 15 = 121
  • 121 x 3 = 363
  • Set 2: 29 – 58 – 43 – 129
  • 29 x 2 = 58
  • 58 - 15 = 43
  • 43 x 3 = 129

The pattern is consistent: multiply by 2, subtract 15, multiply by 3.

Now let's check the options:

  • Option 1: 13 – 26 – 46 – 138
  • 13 x 2 = 26
  • 26 + 20 = 46 (Doesn't follow the pattern)
  • Option 2: 42 – 84 – 74 – 222
  • 42 x 2 = 84
  • 84 - 10 = 74 (Doesn't follow the pattern)
  • Option 3: 73 – 146 – 114 – 228
  • 73 x 2 = 146
  • 146 - 32 = 114 (Doesn't follow the pattern)
  • Option 4: 35 – 70 – 55 – 165
  • 35 x 2 = 70
  • 70 - 15 = 55
  • 55 x 3 = 165

Only Option 4 follows the pattern: multiply by 2, subtract 15, multiply by 3.

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Important Questions from Number Based

  1. In the following question, four number pairs are given. The number on left side of (-) is related to the number of the right side of (-) with some Logic/Rule/Relation. Three are similar on basis of same Logic/Rule/Relation. Select the odd one out from the given alternatives.

  2. Select the set in which the numbers are related in the same way as are the number of the following set.

    (3, 7, 58)

  3. Find the odd number/letters from the given alternatives.

  4. Find the odd number/letters from the given alternatives.

  5. Identify the number which is different from the other.

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