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Value of r for which expression ^20Cr ^2...

Value of `r` for which expression `^20C_r ^20C_0+^20C_(r-1) ^20C_1+^20C_(r-2)^20C_2+?+^20C_0 ^20C_r` is maximum is equal to (A) `10` (B) `20` (C) `15` (D) `11`

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