1.

Answer these questions based on the following informations There are n points on a plane, out of which m are collinear points, such that mltn Find the maximum number of straight lines formed by joining them.

Answer»

`^(n-m)C_2+1`
`^nC_2-^mC_2-1`
`^(n-m)C_2-1`
`^nC_2-^mC_2+1`

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