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The number of ways of selecting exactly ...

The number of ways of selecting exactly 4 fruits out of 4 apples, 5 mangoes, 6 oranges is

A

10

B

15

C

20

D

25

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The correct Answer is:
B
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DISHA PUBLICATION-PERMUTATIONS AND COMBINATIONS-PRACTICE EXERCISES ( FOUNDATION LEVEL)
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  13. If ""^(n)Pr=720 ""^(n)C(r) then r is equal to

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