Q2 PERMUTATION AND COMBINATION
Ten points are marked on a straight-line and 11 points are marked on another straight-line. How many triangles can be constructed with vertices from among the above points?
For a triangle, two points on one
line and one on the other has to be chosen.
No. of ways =10C2×11C1+11C2×10C1=1,045.
No. of ways =10C2×11C1+11C2×10C1=1,045.
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