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In a triangle ABC the value of sum(r=0)^...

In a triangle ABC the value of `sum_(r=0)^(50) ^(50)C_r a^rb^(50-r)` cos(Rb-(50-r)A) is

A

`c^49`

B

`(a+b)^50`

C

`(2s-a-b)^(50)`

D

none of these

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The correct Answer is:
C
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