How many lines are determined by 10 points if no 3 points lie on a straight line?
A)41
B)45
C)32
D)36
E)90

Name: How many lines are determined by 10 points if no 3 points lie on a straight line? A)41 B)45 C)32 D)36 E)90
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Question

Quizplus · Accepted Answer

Two points determine a line, so with 10 points and no 3 points lying on a straight line, the number of lines determined is given by the combination formula for choosing 2 points out of 10, which is 10C2 = (10*9)/(2*1) = 45.

How Many Lines Are Determined by 10 Points If No