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Social Security Numbers A social security number consists of nine digits. How many different social security numbers are possible if repetition of digits is permitted? There is a possibility of 10 numbers in each place. There are 9 places in a social security number (123-456-789)… 10^9=10x10x10x10x10x10x10x10x10=1 billion =1 billion combinations is this right????

Mathematics
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the second part is my solution
Can u have zero as ur first digit?
Your thought as long as your answer too, are completely right.. :)

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Other answers:

if zero can be ur first digit as well, your answer and thought are correct

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