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Question

The letters of word OUGHT are written in all possible orders and these words are written out as in a dictionary. Find the rank of the word TOUGH in this dictionary.

A
89
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B
90
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C
91
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D
92
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Solution

The correct option is D 89
Starting with G there are 4!
Starting with H there are 4!
Starting with O there are 4!
Starting with TG there are 3!
Starting with TH there are 3!
Starting with TOG there are 2!
Starting with TOH there are 2!
Starting with TOUGH there are 1!

The rank of the word TOUGH in this dictionary
=4!+4!+4!+3!+3!+2!+2!+1!=89thword

Hence, option 'A' is correct.

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