How many permutations of the letters a, b, c, d, e, f, g either begin with an a or end with an a?

Question

Mathematics

Cailyn Hebert

22 April, 10:29

How many permutations of the letters a, b, c, d, e, f, g either begin with an a or end with an a?

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Answers (1)

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Gustavo Clay · Answer 1

There are 7 letters to arrange:

if they have to start with a, the remaining arrangement is 6! starting with a

Same logic if they end by a:

So the total number of permutation is 6! + 6! = 2 (6!) = 1440 permutation