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10C8 (0.5)^8 x (0.5)^2 = 0.044 n=10 , x=8 , p = 0.5 out of 10, you choose 8 p of getting boys = 0.5 p of getting girls = 0.5 otherway, get exactly 2 girls 10C2 (0.5)^10 = 0.044