How many digits in all are required to write numbers from 1to 50?

(1) 100 (2) 92 (3) 91 (4) 50

Solution:

Number of digits from 1 to 9 = 9
Number of digits used in writing
from 10 to 50
= 41 x 2 =82
:. Total digits =82 + 9 = 91

Then Option is (3) 91