Permutation, Combination and Fundamental Counting ...

How many 2 digit numbers can you make using the digits 1, 2, 3 and 4 without repeating the digits? How many 3 letter “words” can you make out of the letters CRAZY? In a lottery, 4 winners will get equal prizes. If 20 people enter the lottery, how many different groups of 4 winners can be chosen? Edgar is getting better at math. ................
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