Question

How many three digit locker combinations are possible if the last number must be an even number?

Answer 1

for the 1st 2 you have a variety of 10 numbers; 1,2,3,4,5,6,7,8,9,0

and its 2 so 20+?

there are only 4 even numbers possible;2,4,6,8

so 20+4=24 combinations