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Ask iit jee aieee pet cbse icse state board community Community Discussion Question: Permutation & combination
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[Post New]27 Dec 2007 21:19:10 IST
    Subject: Permutation & combination
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nitd (0)

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In how many ways 5 boys & 5 girls be arranged so that at least 2 girls are together?
 
I know one answer
 
10! - 5! x 6!
 
In this answer we substracting the unfavourable case that is grils will not be together.
But what if we want to take the favourable case?
 
I have taken the favourable cases as follows
 
2 girls will be together, 3 girls will be together, 4 girls will be together & 5 girls will be together , but both the answers are not matching.
 
SO CAN ANYONE HELP ME FOR THAT?
 
    
[Post New]27 Dec 2007 22:47:18 IST
    Subject: Permutation & combination
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master_purav (1343)

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That way also you will get the same answer. Why waste time???????
"If you win, you shall not have to explain and if you lose, you wont be there to explain"
~ Adolph Hitler
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[Post New]28 Dec 2007 19:01:20 IST
    Subject: Re:Permutation & combination
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m.mannattil (12)

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the problem is that when u consider the case of 3 gals being together u will be counting the case when 2 gals are together again.
\m/annattil
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[Post New]28 Dec 2007 19:09:22 IST
    Subject: Re:Permutation & combination
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svj29 (2196)

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i too agree with m.mannattil
PROGRESS ISN'T MADE BY EARLY RISERS OR HARD WORKERS, BUT BY LAZY PEOPLE TRYING TO FIND EASIER WAY TO DO THE SAME.....SO BE LAZZZZYY!!!!
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