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Ten different letters of an alphabet are...

Ten different letters of an alphabet are given. Words with five letters are formed from these given letters. Determine the number4 of words which have at least one letter repeated.

A

69760

B

30240

C

99748

D

none of these

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The correct Answer is:
A
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OBJECTIVE RD SHARMA ENGLISH-PERMUTATIONS AND COMBINATIONS-Exercise
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  4. If 7 points out of 12 are in the same straight line, then the number o...

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  6. No. of diagonals of a polygon are 170. No. of sides in this polygon ar...

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  7. The number of all possible selections of one or more questions from 10...

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  9. A box contains 4 white balls, 5 black balls and 2 red balls. The numbe...

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  10. Find the number of different permutations of the letters of the word ...

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  12. Find the number of ways in which 8 different flowered can be strung to...

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  13. The number of words which can be formed out of the letters a, b, c, d,...

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  14. The smallest value of x satisfying the inequality ""^(10)C(x-1)gt2.""^...

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  15. The number of arrangenments which can be made using all the letters of...

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  16. The number of ways of choosing a committee of 4 women and 5 men from 1...

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  17. A set contains 2n+1 elements. The number of subsets of this set conta...

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  18. The number of ways in which any four letters cab be selected from the ...

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  19. A 5 digit number divisible by 3 is t formed sing the digits 0,1,2,3,4 ...

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  20. If 7 points out of 12 are in the same straight line, then the number o...

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