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four person are choosen at random from a group of 3 mens, 2 womens, &4 childrens. find the probability of selecting exactly 2 children?
Dear neil hans
number of ways in which 4 person can be choosen =9C4
number of ways in which exactlt two children are choosen =4C2 *5C2
Probablity =4C2 *5C2 /9C4
=6*10/126
=10/21
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