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Six line segments of lengths 2,3,4,5,6,7...

Six line segments of lengths `2,3,4,5,6,7` units are given. The number of triangles that can be formed by there lines is-

A

`""^(6) C_(3)-7`

B

`""^(6)C_(3)-6`

C

`""^(6)C_(3)-5`

D

`""^(6)C_(3)-8`

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The correct Answer is:
A
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