p^3[{3\choose 3}*q^0 + {4\choose 3}*q^1+{5\choose 3}q^2 +{6\choose 3}q^3], where p = 1/4, q = 3/4p^3[{3\choose 3}*q^0 + {4\choose 3}*q^1+{5\choose 3}q^2 +{6\choose 3}q^3], where p = 1/4, q = 3/4

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