∑ r=1 n ( n-1 C r-1 )^2 = 2n-2 C n-1 Prove this. Please show how square of ( n-1 C r-1 ) equal to 2n-2 C n-1 ??

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∑ r=1 n ( n-1 C r-1 )^2 = 2n-2 C n-1 Prove this. Please show how square of ( n-1 C r-1 ) equal to 2n-2 C n-1 ??

∑_r=1ⁿ (^n-1C_r-1 )^2 = ^2n-2C_n-1
Prove this. Please show how square of (^n-1C_r-1 ) equal to
^2n-2C_n-1??

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∑ r=1 n ( n-1 C r-1 )^2 = 2n-2 C n-1 Prove this. Please show how square of ( n-1 C r-1 ) equal to 2n-2 C n-1 ??

∑r=1n (n-1Cr-1 )^2 = 2n-2Cn-1 Prove this. Please show how square of (n-1Cr-1 ) equal to 2n-2Cn-1 ??

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∑_r=1ⁿ (^n-1C_r-1 )^2 = ^2n-2C_n-1
Prove this. Please show how square of (^n-1C_r-1 ) equal to
^2n-2C_n-1??