If (1-x+x^2 )^n=a_0+a_1x+a_2x^2+ +a_ 2n x^ 2n then the value of a_0+a_2+a_4+ +a_ 2n is

JEE Main Mathematics question

If then the value of is

Answer: (D)

At : ; at : . Adding the two,

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Question ID VK-021020