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Fundamental Principle of Counting

Ten different...

Question

Ten different letter of an alphabet are given. Words with five letters are formed from these given letters. Then the number of words which have at least one letter repeated is:

A

19670

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B

39758

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C

69760

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D

99748

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Solution

The correct option is C 69760
(C) The total number of words that can be formed with five letters out of the ten given letters
=105=100000

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