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There are 15 points in a plane, no three...

There are 15 points in a plane, no three of which are in a st. line, except 6, all of which are in a st. line. The number of st. lines, which can be drawn by joining them is :

A

`""^15C_2-6`

B

`""^15C_2-""^6C_2`

C

`""^15C_2-""^6C_2-1`

D

`""^15C_2-""^6C_2 +1`.

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