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In a plane th...

Question

In a plane there are 10 points out of which 4 are collinear, then the number of triangles that can be formed by joining these points are

A

60

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B

116

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C

115

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D

105

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Solution

The correct option is B
116

Required number of triangles

= $^{10} C_{3} -^{4} C_{3}$ = 120 - 4 = 116

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