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CBSE Class 11-science Answered

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 (i) Exactly 3 girls (ii) At least 3 girls (iii) At most 3 girls
Asked by Topperlearning User | 04 Jun, 2014, 01:23: PM
answered-by-expert Expert Answer
(i) A committee consisting of 3 girls and 4 boys can be formed in ways
=504 ways
 
(ii) A committee having at least 3 girls will consists of
 
(a) 3 girls 4 boys
(b) 4 girls 3 boys
 
This can be done in  ways
 
(iii) A committee having at most 3 girls will consist of
(a) No girl 7 boys
(b) 1 girl, 6 boys
(c) 2 girls, 5 boys
(d) 3 girls, 4 boys
 
Answered by | 04 Jun, 2014, 03:23: PM

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