SOLUTION: there are 10 orange balloons , 9 blue balloons ,12 green balloons and 9 white balloons.if 7 balloons are chosen at random without replacement. find the probability that exactly 3

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Question 1071094: there are 10 orange balloons , 9 blue balloons ,12 green balloons and 9 white balloons.if 7 balloons are chosen at random without replacement. find the probability that exactly 3 green balloons are chosen.
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
There are C(40,7) possible choices.
There are 28 non-green balloons,
So,
P=%28C%2828%2C4%29%2AC%2812%2C3%29%29%2F%28C%2840%2C7%29%29
P=+%2820475%2A220%29%2F%2818643560%29
P=+5775%2F%2823902%29