Question

A small combination lock on a suitcase has 5 ​wheels, each labeled with the 10 digits from 0 to 9. If an opening combination is a particular sequence of 5 digits with no​ repeats, what is the probability of a person guessing the right​ combination?

Answer 1

There are 10 possible number on the first wheel, their would be 9 possible on the second, 8 on the thrid, 7 on the frouth, and 6 on the fifth. 

So, 10 * 9 * 8 * 7 * 6 = 30,240 possible combinations without repeating numbers.