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A committee of 7 has to be formed from 9...

A committee of 7 has to be formed from 9 boys and 4 girls. In how many wasy can this be done, when the committee consists of:
at least 3 girls?

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A committee of 7 has to be formed from 9 boys and 4 girls. In how many ways can this be done when the committee consists of: atleast 3 girls ?

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JBD PUBLICATION-PERMUTATIONS AND COMBINATIONS-EXAMPLE
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