A committee of 7 members has to be formed from 9 boys and 4 girls. In how many ways, can
this be done when the committee consists of at least 3 girls?
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2
Answer:
At least 3 girls
This means girls can either be 3 or 4
So first choose 3 girls and 4 boys or 4 girls and 3 boys
Total ways = ⁴C₃*⁹C₄+ ⁴C₄*⁹C₃
= 504 + 84= 588 ways
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504
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