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Question

The sum mi=010Ci20Cmi is maximum when m is:

A
5
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B
10
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C
15
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D
20
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Solution

The correct option is C 15
10Co20Cm+10C120Cm1+......10Cm20C0
We can analyses this as :--
10 red balls & 20 blue balls are kept and we have to choosem number of balls.
S will be maximum when
m=no.ofredballs+no.ofblueballs2
m=10+202=15
Hence the answer is 15.



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