On a parallelogram ABCD, on side AB, 2 points are marked, on side BC, 3 points marked, on side CD, 4 points marked and one side AD, 3 points marked. How many triangles can be made using these points?(no point is marked on the vertex)
On a parallelogram ABCD, on side AB, 2 points are marked, on side BC, 3 points marked, on side CD, 4 points marked and one side AD, 3 points marked. How many triangles can be made using these points?(no point is marked on the vertex) Correct Answer 184
There are two ways to draw triangles with these points.
One is all points are on different sides.
Other is two points are on one and one is on other side.
Required number of triangles =
= 2 × 3 × 4 × 3 + 2C2 × 10 + 3C2 × 9 + 4C2 × 8 + 3C2 × 9
= 72 + 10 + 27 + 48 + 27
= 184
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Feb 20, 2025