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A group of students has 3 boys and 6 girls. Two are chosen at random to represent the school in a spelling competition. Find the probability that both are girls.
Total number of ways to select two students = 9C2 = 36
Total number of ways to select two girls from 6 gals = 6C2 = 15
Probability = 15/36= 5/12
In a school there are 650 students. The ratio of the boys to that of the girls is 8:5. How many more girls should join the school so that the ratio becomes 4:3
6 playing cards were choosen randomly from the pack getting 2 spades, a heart and 3 clubs. What is the probability of getting a club in the next 6 'choose'?
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