If you write down all the numbers from 1 to 100, then how many times do you write 3 ?

Options

A. 11
B. 18
C. 20
D. 21

Answer

C

Explanation

According to the question, From 1 to 100.
3 as the unit.s digit : 3,13,23,33,43,53,63,73,83,93.
3 as the ten.s digit: 30,31,32,33,34,35,36,37,37,38,39.
So, total number of 3.s from 1 to 100 = numbers with 3 as the unit.s digit + numbers with 3 as the ten.s digit `= (10 + 10) = 20`.