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The number of distinct lines that can be formed by joining 20 points on a plane is of which no three points are collinear is

A.	190	B.	380
C.	360	D.	120

Answer and Explanation

Answer:190

Explanation:
The number of lines that can be drawn, joining n points on a plane
 nC2 (when no three points are collinear). Here n = 20
required number of lines = 20C2 = 190

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