Question

How many numbers divisible by 5 lying between 40000 and 50000

can be formed from the digits

0, 3,4,5,8,9, if

a. Repetition of digits is not allowed.

b. Repetition of digits allowed.​

Answer 1

Explanation:

3,4,5,6,7,8

The number is divisible by 5 so the last digit can be 5 one-ways

The number should be between 3000 and 4000 so the first digit can be 3 in one-ways

Since repetition is not allowed second and third digit can be in 4 and 3 ways

so total ways =1×4×3×1=12