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190 * (80/100)^18*(20/100)^2 + 20 * (80/100)^19*(20/100)^1 +(80/100)^20*(20/100)^0
190 * (80/100)^18*(20/100)^2 + 20 * (80/100)^19*(20/100)^1 +(80/100)^20*(20/100)^0
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