Question

The number of $3$ digit numbers having at least one of their digit as $5$ are

• A. 250
• B. 251
• C. 252
• D. 253

Answer 1

Answer: (C)

Total number of $3$ - digit numbers having at least one of their digits as $5=$ Total number of $3$ -digit numbers
- (Total number of $3$ - digit numbers in which $5$ does not appear at all $)=9\times 10\times 10-8\times 9\times 9$
$=900-648=252$