a lock has a code of 5 numbers between 1 and 20 . If no numbers in the code are allowed to repeat, how many different codes could be made?
Thank you
5 answers
20C5
20 * 19 * 18 * 17 * 16
oobleck is correct
its a code ... so the same numbers can be used in a different order
its a code ... so the same numbers can be used in a different order
so ....15,504?
what do i do with these?
20 * 19 * 18 * 17 * 16
20 * 19 * 18 * 17 * 16
2 answers