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(5 choose 2) (3/8*0.2 + 5/8*.08)^2 * (1-(3/8*0.2 + 5/8*.08))^3
(5 choose 2) (3/8*0.2 + 5/8*.08)^2 * (1-(3/8*0.2 + 5/8*.08))^3
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