virtus
10 people are arranged around a table. A chairperson and secretary are to be elected. How many arrangements are possible such s that the chairperson and secretary are opposite each other
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hba
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Remember that a circular permutation is (n – 1)!
hba
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so 9!2!
hba
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is ur ans i guess
virtus
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answer says 7! x 8
Hashir
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its 8!
Hashir
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because
hba
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ohh ok i get it now remove the 2 people (chairperson and secretary) u have total 8 left acc to circular perm 7!
Hashir
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the Secretary and president is not to be arranged
virtus
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OHHHH i got it they are fixed right
Hashir
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therefore the rest can be arranged
Hashir
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thus 8!
Hashir
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got it dumb pants
Hashir
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???????
virtus
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ya dumbpants has got it!
ujjwal
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Suppose there is no chairperson and secretary. Now you have eight members. who can be arranged in 7! Now one among the pair of secretary and chairperson can be seated in 8 ways around the table ( the other will be just opposite). so, you have a total of 7! \(\times\) 8
Hashir
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i m doing the same thing .... @ujjwal
ujjwal
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yeah! great Job!! @Hashir
Hashir
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what the hell is what ?
Hashir
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idk
hba
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dude u are not allowed to ask for it
hba
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@ujjwal
virtus
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awks.... ummm well thanks everyone!
hba
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welcome
Hashir
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pleasure
ujjwal
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Great! close it now @virtus