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![[Post New]](/templates/default/images/icon_minipost_new.gif) 30 Jul 2008 11:09:44 IST
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There are 2 brothers among a group of 20 persons. In how many ways can the group be arrang
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30 Jul 2008 19:53:58 IST
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for 1st brother at pos 1
there are 19 pos of 2nd brother.
for 1st brother at pos 2
there are again 19 pos of 2nd brother.
...
for 1st brother at pos 20
there are again 19 pos of 2nd brother.
therefore there are 20*19=380 no. of possible arrangements
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30 Jul 2008 19:59:39 IST
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itz simple use permutation.............P(20,2)=20!/18! =380
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30 Jul 2008 20:36:28 IST
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Just giving the reason behind it.
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