In a plane there are 10 points out of wh...

In a plane there are 10 points out of which no three are collinear except the four which lie on a straight line . By joining these 10 points how many straight lines.

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In a plane there are 10 points out of which no three are collinear except the four which lie on a straight line .By joining these 10 points how many (a) straight lines , (b) trangles can be obtained ?

In a plane there are 10 points out of which no three are collinear except the four which lie on a straight line . By joining these 10 points how many triangles may be obtained.

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There are 10 points in a plane of which 4 are collinear, Find the number of lines obtained from the pairs of these points.

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There are 10 points in a plane of which 4 are collinear, find the number of triangles that can be formed from these points.

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