SOLUTION: How many diffeent 7 digits telephone numbers are possible if the first digit cannot be zero and no digit may repeat?
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Question 896744: How many diffeent 7 digits telephone numbers are possible if the first digit cannot be zero and no digit may repeat? Answer by stanbon(75887) (Show Source):
You can put this solution on YOUR website! How many diffeent 7 digits telephone numbers are possible if the first digit cannot be zero and no digit may repeat?
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Ans: 9*9*8*7*6*5*4 = 544320
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Cheers,
Stan H.
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