1.

Thereare n pointsin a planeno threeofwhichare in thesamelineexceptingp pointswhich arecollinear. Thenumberof triangle fomedby joiningthem is

Answer»

`""^(N)C_(2)`
`""^(n)C_(2)-""^(p)C_(2)`
`""^(n-p)C_(3)`
`""^(n)C_(3)-""^(p)C_(3)+1`

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