sferguson sferguson

23-06-2017
Mathematics

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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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mreijepatmat mreijepatmat

23-06-2017

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

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