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+1 vote
7.3k views
in Permutation and Combinations by (15.9k points)

If the letters of the word MOTHER be permuted and arranged as in a dictionary, find the rank of the word.

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1 Answer

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by (15.4k points)

The order of the letters will be E, H, M, O, R, T

E .... .... .... .... .... Ways = 5! = 120
H .... .... .... .... .... Ways = 5! = 120
M E .... .... .... .... Ways = 4! = 24
M H .... .... .... .... Ways = 4! = 24
M O E .... .... .... Ways = 3! = 6
M O H .... .... .... Ways = 3! = 6
M O T E .... .... Ways = 2! = 2
M O T H E R Ways = 1

Therefore the position of ‘MOTHER’ is 120 + 120 + 24 + 24 + 6 + 6 + 6 + 2 + 1 = 309.

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