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Discussion Response Post to: permutation and combination

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23 Feb 2008 12:01:48 IST

Subject: Re:permutation and combination

sboosy (3063)

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Second question

case 1 )

4 boys 2 girls

10C₄ (7C₂-1)

bcos there will be one combination when the 2 girls r together

3 boys 3 girls

10C₃(7C₃-5)

bcos the 2 girls cud b together with any of the other 5

so ans

10C₄(7C₂-1) + 10C₃(7C₃-5)

but pls correct me if wrong

this reply: 5 points (with 1 Olaaa!! Perrrfect answer.

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