SOLUTION: how many different 5-digit codes are possible using the keypad shown at the right if the first digit cannot be 0 and no digit may be used more than once

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Question 438176: how many different 5-digit codes are possible using the keypad shown at the right if the first digit cannot be 0 and no digit may be used more than once
Answer by jorel1380(3719) About Me  (Show Source):
You can put this solution on YOUR website!
Nine different digits combined 5 at a time is expressed as 9C5=9x8x7x6x5!/4x3x2x5!=126