1/6(0+combination(2,1)*(1/2)^2+0+combination(4,2)*(1/2)^4+0+combination(6,3)*(1/2)^6)1/6(0+combination(2,1)*(1/2)^2+0+combination(4,2)*(1/2)^4+0+combination(6,3)*(1/2)^6)

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