Probability counting principle

Reference no: EM13122414

Probability : Counting Principle
A social security number has 9 digits. How many different S.S numbers are possible if:

a. repetition of digits is permitted
b. repetition of digits is not permitted
c. the first digit cannot be a 0 and repetition is not permitted

I need the layout (counting principle)
ex. 9 8 7 - 6 5 - 2 1 4 3

Reference no: EM13122414

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