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sum(multinomial(l,n,N-l-n)*(p/2)^l*(p/2)^n*(1-p)^(N-l-n),l,0,N-n)
sum(multinomial(l,n,N-l-n)*(p/2)^l*(p/2)^n*(1-p)^(N-l-n),l,0,N-n)
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