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Suppose that a word is any string of seven letters of thealphabet, with repeated letters allowed. a) How many words are there? b) How many

Suppose that a “word” is any string of seven letters of thealphabet, with repeated letters allowed.

a) How many words are there?

b) How many words end with T?

c) How many words begin with R and end with T?

d) How many words begin with A or B?

e) How many words begin with A or end with B?

f) How many words begin with A or B and end with A or B?

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