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From a committee of 10 persons, in how m...

From a committee of 10 persons, in how many ways can we choose a chairman, vice-chairman and president assuming one peron can not hold more than one position ?

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KUMAR PRAKASHAN-PERMUTATIONS AND COMBINATIONS-PRACTICE WORK
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  4. How many 3-digit even numbers that can be formed using the digit 2,4,6...

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  5. Find r : ""^(5) P(r) =42 ""^(6)P(r-1)

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  6. Prove that , ""^nPr = ""^((n-1))Pr + r. ""^(n-1)P((r-1))

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  7. If ""nPr=840 and ""^nCr=35, then r is equal to....

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  8. If ""^((n+2)) C8 :"" ^((n-2)) P4= 57 : 16 then find n.

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  9. If ""^nC10= ""^nC12 then find ""^23Cn.

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