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Permutations and combinations

Submitted by abhijith on Mon, 2008-06-09 17:45

Hi
can any 1 tell me how to solve this
Q) what is the number of circles that can be drawn using 10 points of which 7 are collinear
?

‹ p and c combination ›

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Posted on: Mon, 2008-06-09 18:03 #1
HUMRAJ!!!!!!!!!

ANS. 10C3 - 7C3

Posted on: Tue, 2008-06-10 14:56 #2
could you please explian the

could you please explian the problem in detail,,...

Posted on: Tue, 2008-06-10 14:57 #3
could you please explian the

could you please explian the problem in detail,,...

Posted on: Wed, 2008-06-11 09:16 #4
ok i help u ans is here

ok
 
i help u

ans is here 7c1*3c2 + 7c2*3c1

so total=84

menas , in first case taken 1 point from 7 collinear point and 2 point from 3 non-collinear point

            in second case taken 2 point from 7 collinear point and 1 point from 3 non-collinear point

but out of 3 non-collinear also make 1 more triangle

so total 85

I hope now u can understand

Little Star

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