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Ten different letters of an alphabet are given Words with 5 letters are formed from the given letters.

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Ten different letters of an alphabet are given Words with 5 letters are formed from the given letters. The no, of words which have atleast one letter repeated is _______

(a) 69750 

(b) 30240 

(c) 9948 

(d) 10680

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1 Answer

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Best answer

Correct option: (a) 69750

Explanation:

Number of words with 5 letters = 105

Number of words with 5 letters without repetitions = 10P5 

∴ Required number of words = 105 - 10P5 = 69750

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