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Arithmetic Reasoning - Verbal and Reasoning

Q1:

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

A 11

B 18

C 20

D 21

ANS:C - 20

Explanation: 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.