Question

The smallest five-digit number that can be formed using 0, 8, 4, 5, and 7, without repeating any digit is.

• A. 04,578
• B. 40,578
• C. 80,745

Answer 1

The correct option is B 40,578

Arrange the digits in the increasing order of their values.
0 < 4 < 5 < 7 < 8
Place the smallest digit at the largest place and arrange the remaining digits in an increasing order.
Watch out! 4,578 has only four digits since 0 has no value at the beginning of a number!
To form the smallest five-digit number, place 0 in the second highest place.
Thus, the smallest five-digit number that can be formed is 40,578.