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 (a) straight lines , (b) trangles can be obtained ?

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The correct Answer is:

40 and 116

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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 straight lines.

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