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[" 16.The value of "r" for which "],[qqu...

[" 16.The value of "r" for which "],[qquad [^20C_(r)^(20)C_(0)+^(20)C_(r-1)^(20)C_(1)+^(20)C_(r-2)^(20)C_(2)+cdots," 20"],[+^(20)C_(0)^(20)C_(r)]]

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The value of r for which .^(20)C_(r ). ^(20)C_(0)+ .^(20)C_(r - 1) .^(20)C_(1) + .^(20)C_(r - 2).^(20)C_(2) + …… + .^(20)C_(0) .^(20)C_(r ) is maximum, is

The value of r for which .^(20)C_(r ), .^(20)C_(r - 1) .^(20)C_(1) + .^(20)C_(2) + …… + .^(20)C_(0) .^(20)C_(r ) is maximum, is

The value of r for which .^(20)C_(r ), .^(20)C_(r - 1) .^(20)C_(1) + .^(20)C_(2) + …… + .^(20)C_(0) .^(20)C_(r ) is maximum, is

The value of r for which .^(20)C_(r ), .^(20)C_(r - 1) .^(20)C_(1) + .^(20)C_(2) + …… + .^(20)C_(0) .^(20)C_(r ) is maximum, is

The value of r for which .^(20)C_(r ), .^(20)C_(r - 1) .^(20)C_(1) + .^(20)C_(2) + …… + .^(20)C_(0) .^(20)C_(r ) is maximum, is

1.^(20)C_(1)-2.^(20)C_(2)+3.^(20)C_(3)-...-20.^(20)C_(20)

Value of r for which expression 20C_(r)^(20)C_(0)+20C_(r-2)^(20)C_(1)+20C_(r-2)^(20)C_(2)+.......+20C_(0)^(20)C_(r) is maximum is equal to (A) 10 (B) 20 (C) 15 (D) 11

The value of .^(20)C_(0)+.^(20)C_(1)+.^(20)C_(2)+.^(20)C_(3)+.^(20)C_(4)+.^(20)C_(12)+.^(20)C_(13)+.^(20)C_(14)+.^(20)C_(15) is