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21 August, 16:03

The names of 9 boys and 2 girls in a hat. What is the probability of first drawing a girls name then a boys name from the hat?

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  1. 21 August, 16:04
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    A - drawing a girls name at first

    P (A) = 2 / (2+9) = 2/11

    B - drawing a boys name in second drawing if first drawing was a girls name

    P (B) = 9/10

    C - drawing a girls name firstly and a boys name secondly

    P (C) = P (A) * P (B) = 2/11 * 9/10 = 9/55

    ans: 9/55
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