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Q.

The sum ∑i=0m 10i20m−i (where pq=0 if  p < q) is maximum where m is

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a

5

b

10

c

15

d

20

answer is C.

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Detailed Solution

We have ∑i=0m 10i20m−i              = the number of ways of choosing m persons             out of 10 men and 20 women             = the number of ways of choosing m persons             out of 30 persons             =30CmBut  30Cm is maximum for m = 15.
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