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How many triangles are formed by selecting points from a set of 15 points out of which 8 are collinear?
Rohit Gupta 8
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Dec 25, 2017
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How many triangles are formed by selecting points from a set of 15 points out of which 8 are collinear?
(a) 800 (b) 824 (c) 844 (d) 854
combinatory
Rohit Gupta 8
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Dec 25, 2017
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Rohit Gupta 8
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hs_yadav
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Dec 25, 2017
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399..correct
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Ajay Jadhav
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Dec 25, 2017
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3 points from nonlinear group=7C3=35
2 points from nonlinear group and 1 point from collinear =(7C2)*(8c1) =168
2 points from collinear group and 1 from 7 points =(8C2)*(7C1)=196
35+168+196=399
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srestha
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Dec 25, 2017
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yes I did same
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