Below are given two sets of numbers. In each set of numbers, a certain mathematical operation on the first number results in the second number. Similarly, a certain mathematical operation 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 question?
(NOTE – A two/three-digit number cannot be broken into individual digits for operations,
e.g. if 37 is followed by 10, the operation cannot be 3+7 as a two-digit number cannot be
broken into individual digits.)
14 - 15 - 20 - 40 ; 19 - 20 - 25 - 50

Question

Question

This question was previously asked in

RRB NTPC Graduate Level CBT-I Official Paper (Held On: 06 Jun, 2025 Shift 2)

Answer 1

The logic followed here is,

Logic: Add 1, then Add 5, then Multiply by 2.

For: 14 - 15 - 20 - 40

14 + 1 = 15

15 + 5 = 20

20 × 2 = 40

For: 19 - 20 - 25 - 50

19 + 1 = 20

20 + 5 = 25

25 × 2 = 50

Now, let's check which of the given options follows the same set of operations:

1) 7 - 9 - 18 - 20

This option does not follow the pattern.

2) 8 - 10 - 15 - 30

This option does not follow the pattern.

3) 5 - 6 - 11 - 22

This option follows the exact same set of operations.

4) 3 - 4 - 9 - 14

This option does not follow the pattern.

Hence, the correct answer is "Option 3".