Using binomial theorem (without using th...

Using binomial theorem (without using the formula for `^n C_r` ) , prove that `"^n C_4+^m C_2-^m C_1^n C_2 = ^m C_4-^(m+n)C_1^m C_3+^(m+n)C_2^m C_2-^(m+n)C_3^m C_1+^ (m+n)C_4dot`

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