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

Question

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

A. 21

B. 30

C. 20

D. 11

Answer: C. 20

Solution:

Clearly, From 1 to 100,

there are ten numbers with 3 as the unit’s digit – 3, 13, 23, 33, 43, 53, 63, 73, 83, 93 and

ten numbers with 3 as the ten’s digit – 30, 31, 32, 33, 34, 35, 36, 37, 38, 39.

So, required number = 10 + 10 = 20.

Hence, The Answer is 20.

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