If (1+x-2x^2 )^6=1+a_1x+a_2x^2+ +a_ 12 x^ 12 , then the value of a_2+a_4+ +a_ 12 is

JEE Main Mathematics question

If , then the value of is

Answer: (A)

At : ; at : . Adding,

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Question ID VK-020998