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how may four letter words can be formed uysing het letters of the word FAILURE so that F is included in each word? F is not include in any word?

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RD SHARMA ENGLISH-COMBINATIONS-All Questions
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  3. how may four letter words can be formed uysing het letters of the word...

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  15. If C(35, n+7)= C(35, 4n-2) then all the values of n are

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  16. Write the number of diagonals of an n-sided polygon.

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  17. Write the expression \ ^n C(r+1)+\ ^n C(r-1)+2xx\ ^n Cr in the simples...

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