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Question

Given 5 line segments of lengths 2,3,4,5,6 units. Then the number of triangles that can be formed by joining these lines is

A
5C3
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B
5C33
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C
5C32
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D
5C31
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Solution

The correct option is D 5C33
For a triangle we need 3 segments and sum of any two segments must be greater than the other segment
Thus, (2,3,5),(2,3,6) and (2,4,6) have to be considered while making a selection and excluded.
No. of triangles=5C3111
=5C33

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