Question

solve this sum How many three digit number divisible by 5

Answer 1

Three digit number divisible by 5 are

100, 105, ...............995

This is an A.P with common difference 5

$n = \frac{l - a}{d} + 1$
$= \frac{995 - 100}{5} + 1$
$= \frac{895}{5} + 1$
$= 179 + 1 = 180$
there are 180 three digit numbers divisible by 5