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27 July, 19:34

In a class, there are 18 girls and 14 boys. If the teacher selects two students at random to attend a party with the principal, what is the probability that the two students are the opposite gender?

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  1. 27 July, 20:21
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    number of different pairs the teacher can choose = nCr (18+14, 2) = 496

    no. of opposite gender pairs possible = 14 (since there are only 14 boys)

    probability = 14/496 = 7/248
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