Question

Select the number that can replace the question mark (?) in the following series.

5, 3, 3, 5, 15, ?

1. 59
2. 69
3. 45
4. 39

Answer 1

Correct option is (2) 69

The logic is:

5 × 1 – 2 = 3

3 × 2 – 3 = 3

3 × 3 – 4 = 5

5 × 4 – 5 = 15

15 × 5 – 6 = 69

Answer 2

Correct Answer - Option 2 : 69

The logic is:

5 × 1 – 2 = 3

3 × 2 – 3 = 3

3 × 3 – 4 = 5

5 × 4 – 5 = 15

15 × 5 – 6 = 69

Hence, ‘69’ is the correct answer.