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a password is made up using 6 digits: a. using repeting digits how many possibilities are there? b. how many possibilities are there if repeting

a password is made up using 6 digits:

a. using repeting digits how many possibilities are there?

b. how many possibilities are there if repeting digits are not okay?

c. if repetition is okay how many possibilities are there if the password must begin with 7 or 8 and must include 2-3 additional letters?

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