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

Question

Brogan Oliver

Mathematics

2 December, 23:43

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

+1

Answers (1)

Know the Answer?

Hayley Beard · 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