How many three digit numbers can be made from the digits 1,\ldots,9 if repetitions of digits are not allowed?

+1

(1) Answers

ashleyam2128

9 values for each digit, order matters: 123 is different than 321, and no repetion
9*8*7 = 504
Look at a simpler example, with 1, 2, 3:
123
132
213
231
312
321
6 numbers
3*2*1 = 6