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Find: (nC0)^2+(nC1)^2+(nC2)^2+.......+(n...

Find: `(nC_0)^2+(nC_1)^2+(nC_2)^2+.......+(nC_n)^2`

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If n=5 , then (^nC_(0))^(2)+(^nC_(1))^(2)+(^nC_(2))^(2)+....+(^nC_(5))^(2) is equal to

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