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The sum sum(m)^(i=0) ({:(10),(i):})({:(2...

The sum `sum_(m)^(i=0) ({:(10),(i):})({:(20),(m-i):})`, (where `({:(p),(q):})= 0`, if `p lt q`) is maximum when `'m'` is

A

5

B

10

C

15

D

20

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The correct Answer is:
A
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