Asked by Fred

A 4 digit number is to be selected at random from the numbers 0 to 9 with no repetition of digits. How many arrangements can there be?

I keep getting 5040 by doing 10 x 9 x 8 x 7 but the answers say 4536 ways. I dont know what I am doing wrong.
Answered by Steve
the first digit cannot be zero. That leaves
9*9*8*7 = 4536
Answered by Fred
Ahh yes forgot about zero. Thanks heaps
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