Question

In the following number series, a wrong number is given. Find out the wrong number.

1, 2, 6, 20, 88, 445

1. 1
2. 445
3. 6
4. 20
5. 88

Answer 1

Correct Answer - Option 4 : 20

Given:

The number series:

1, 2, 6, 20, 88, 445

Concept Used:

Number series following a fixed pattern.

Calculation;

The given number series follows the pattern:

1 × 1 + 1 = 2 

2 × 2 + 2 = 6

6 × 3 + 3 = 21

21 × 4 + 4 = 88

88 × 5 + 5 = 445

∴ The Wrong Number in the given number series is 20