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| 1. |
Show that the point A (1,-1,3),B (2,-4,5),C(5,-13,11) are collinear |
| Answer» 1/2[ x1(y2-y3) + x2(y3-y1) + x3(y1-y2) ] = 0 (if the points are colinear) put the values & check | |