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Questions  

The sum i=0m10i20mi, where ,pq=0, if p<q is maximum, when m is

a
5
b
10
c
15
d
20

detailed solution

Correct option is C

∵∑i=0m 10i20m−i=∑i=0m 10Ci20Cm−1= Coefficient of xm in the expansion of (1+x)10(1+x)20=30CmIt is maximum, when m=302=15

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