Question

In an experiment sum of first 99 natural number is recorded as x. Find the sum of digits of x.

1. 18
2. 20
3. 22
4. 24

Answer 1

Correct Answer - Option 1 : 18

Given

x is the sum of first 99 natural number.

Formula used

Sum of n natural number = n × (n+1)/2

Calculation

⇒ x = (99 × 100)/2

⇒ x = 4950

⇒ Now, sum of the digits of x = 4 + 9 + 5 + 0 = 18.

∴ 18 is the required answer.