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A plane contains 20 points of which 6 ar...

A plane contains 20 points of which 6 are collinear. How many different triangle can be formed with these points?

A

1120

B

1140

C

1121

D

1139

Text Solution

Verified by Experts

The number of triangles that can be formed from n points in which in points are colinear is `.^(n)C_(3)-.^(m)C_(3)`.
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