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There are ten points in a plane. Of these ten points, four points are in a straight line and with the exceptionof these four points, on three points are in the same straight line. Find i. the number of triangles formed, ii the number of straight lines formed iii the number of quadrilaterals formed, by joining these ten points.A. 90B. 45C. 40D. 30 |
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Answer» Correct Answer - B A straight line can be formed by joining 2 points `:.` Total number of straight lines `= .^(10)C_(2)` `= (10 xx 9)/(2 xx 1) = 45` |
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