The expression ^nC_r+4 ^nC_ r-1 +6 ^nC_ r-2 +4 ^nC_ r-3 + ^nC_ r-4 equals

JEE Main Mathematics question

The expression {}^nC_r+4\cdot{}^nC_{r-1}+6\cdot{}^nC_{r-2}+4\cdot{}^nC_{r-3}+{}^nC_{r-4} equals

Answer: (A)

The coefficients are , so the expression is

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Question ID VK-020752