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Which of the following is/are true...

Which of the following is/are true

A

`.^(n)C_(0).^(n)C_(1)+.^(n)C_(1).^(n)C_(2)+.^(n)C_(2).^(n)C_(3)+……….+.^(n)C_(n-1).^(n)C_(n)=.^(2n)C_(n+1)`

B

`(.^(n)C_(0))^(2)+(.^(n)C_(1))^(2)+(.(n)C_(2))^(2)+………….+(.^(n)C_(n))^(2)=.^(2n)C_(n)`

C

`.^(11)C_(0).^(11)C_(11)-.^(11)C_(1).^(11)C_(10)+.^(11)C_(2).^(11)C_(9)+………+(-1)^(11).^(11)C_(11).^(11)C_(0)=.^(22)C_(11)`

D

`2.^(n)C_(0)+(2^(2).^(n)C_(1))/2+(2^(3).^(n)C_(2))/3+……….+(2^(n+1).^(n)C_(n))/(n+1)=(3^(n+1)-1)/(n+1)`

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