Question

The whole number less than $1000$ that can be formed using the digits $0,1,2,3,4,5$ when repetition is not allowed is equal to

• A. $130$
• B. $131$
• C. $156$
• D. $155$

Answer 1

The correct option is B $131$

The number of one-digit numbers is $6$.
The number of two-digit numbers is $5\times 5=25$
The number of three-digit numbers is $5\times 5\times 4=100$.
Hence, the total number are is $131$.