from a group of 8 volunteers including andrew and karen 4 people are to be selected at random to organize a charity event. what is the probability that andrew will be among the 4 volunteers selected and karen will not?
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The answer is 2/7
This is because we have to place Andrew and 3 others except for Karen in the group. The number of ways to choose 3 members out of 8 (in total) - 2 (Andrew and Karen) = 6, which is written as C 3/6, thus P = C 36/C 48 = 2/7
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