Let (x+10)^ 50 +(x-10)^ 50 =a_0+a_1x+a_2x^2+ +a_ 50 x^ 50 , for all x R; then a_2 a_0 is equal to

JEE Main Mathematics question

Let , for all ; then is equal to

Answer: (A)

The odd powers of cancel, so the coefficient of is for even

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Question ID VK-021298