What should come in place of the question mark 39 39 in the following number series 7 30 48 73 107 ........

Quantitative Aptitude (Phase-1) Number series

What should come in place of the question mark '?' in the following number series?

7, ?, 30, 48, 73, 107

This questions was previously asked in

Nabard grade-A,Previous year Memory Based Paper (2022)

Let’s break this down step by step:

- The series given: 7, ?, 30, 48, 73, 107

- Let’s look at the jumps between each known number:

- 30 to 48: +18

- 48 to 73: +25

- 73 to 107: +34

- Notice how these differences go up each time.

- 18, 25, 34 — these increases are:

- 25 - 18 = 7

- 34 - 25 = 9

- So the jump seems to increase by 2 more each time (7 ? 9).

- If we go backward:

- The previous difference should be 18 - (7 - 2) = 18 - 5 = 13.

- So, 30 - ? = 13 ? ? = 30 - 13 = 17

- Now check options:

- Option 5 is 17

So here's what this really means: the missing number is 17.

Submit Error