SOLUTION: Write an expression for the number of ten-digit numerical codes that can be formed if: a)the digits must all be different b)the digits may repeat

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Question 213140This question is from textbook
: Write an expression for the number of ten-digit numerical codes that can be formed if:
a)the digits must all be different
b)the digits may repeat This question is from textbook

Answer by checkley77(12844) About Me  (Show Source):
You can put this solution on YOUR website!
10!=3,638,800 ans.
10^10=1*10^10 ans.