Question 1026685: how many four digit codes can be formed using the digits 0,1,2,3,4,5,6,7,8,9 if the last digit
cannot be 0 or 1 or 2 and repetition of digits is allowed?
Answer by ikleyn(52786)   (Show Source):
You can put this solution on YOUR website! .
how many four digit codes can be formed using the digits 0,1,2,3,4,5,6,7,8,9 if the last digit
cannot be 0 or 1 or 2 and repetition of digits is allowed?
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 = 7000.
Any of 10 digits in the first position;
any of 10 digits in the second position;
Any of 10 digits in the third position,
and any of 7 digits (from 3 to 9) in the fourth position.
It gives that answer.
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