Question

How many three digits no. Are multiple of 5?without repetitions

Of digit

Answer 1

A multiple of 5 can either end with a 5 or with a 0.

If it is a 5, then you have 8 options for the first digit (0 and 5 are forbidden), then 8 for the second one (first digit and 5 forbidden), which is 64 possibilities.

If it is a 0, then you have 9 options for the first digit (only 0 is forbidden), then 8 for the second one, which is 72 possibilities.

The total is 136.