A PIN consists of 6 numbers, with no repetition of any numbers allowed. How many different PINs are possible?

I did 10 x 9 x 8 x 7 x 6 x 5 = 151 200, but the answers say 720. I dont understand why its 6 factirial. Any explanation would be great. Thanks

Hmmm. It sounds like they are providing a set of only 6 digits to choose from. In that case, there would indeed be only 6! combinations.

10P6 appears to be the correct answer, however.