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Students in a college are allowed to chose their own passwords consisting of three (3) lower-case...

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Advance Math

Students in a college are allowed to chose their own passwordsconsisting of three (3) lower-case letters, in that order. How manydifferent passwords are possible if

a. repetitions allowed?

b. repetitions are not allowed?

c. The first character cannot be 0, with no repetitions are notallowed?

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