(10nCr7) * 0.20^7 * (1-0.20)^(10-7) + (10nCr8) * 0.20^8 * (1-0.20)^(10-8) + (10nCr9) * 0.20^9 * (1-0.20)^(10-9) + (10nCr10) * 0.20^10 * (1-0.20)^(10-10)

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