1.

The straight lines l_(2)||l_(2)||l_(3) and lies in the same plane A total of m points are taken on l_(1) ,n points on l_(2) and k point on l_(3), then maximum number of triangles formed with vertices at these points are

Answer»

`""^(m+n+K)C_(3)-(""^(m)C_(3)+""^(n)C_(3)+""^(k)C_(3))`
`""^(m)C_(3)+""^(n)C_(3)+""^(k)C_(3)`
`""^(m+n+k)C_(3)`
NONE of these

Answer :A


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