Question

The number of 'three digit numbers' which are multiples of $9$ are.

• A. $101$
• B. $99$
• C. $100$
• D. $98$

Answer 1

Answer: (C)

$100$

Smallest and largest $3$ digit number multiplied by $9$ are $108$ and $999$
By AP
$a=108$ $a_n=999$ $d=9$ $n=?$
$999=108+(n-1)9$
$n=100$.