How many 4 digit numbers can be formed from 1 2 3 4 and 5 if repetitions are not allowed?
There are an infinite amount of 4 digit numbers that can be formed from 1 2 3 4 and 5 if repetitions are not allowed. How many combinations of 4 numbers are there? There are six possible combinations of 4 numbers-2. There are also six possible combinations of 5 numbers-3, 4, 5, and 6. How ... Read more...