Question: Consider the alphabet A, B, C, D, E, F and make words without repetition of letters allowed. (a) How many six-letter words are there? (b)

Consider the alphabet A, B, C, D, E, F and make words without repetition of letters allowed. (a) How many six-letter words are there? (b) How many words begin with D or E? (c) How many words end in B or A? (d) How many words begin with D or E and end in B or A? (e) How many have first letter neither D nor E and last letter neither B nor A?

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