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There are p,q,r points on three parallel...

There are p,q,r points on three parallel lines `L_1,L_2 and L_3` respectively, all of which lie in one plane . The number of triangle which can be formed with vertices at these points is :

A

`""^(p+q+r)C_3`

B

`""^(p+q+r)C_3-""^pC_3-""^qC_3-""^rC_3`

C

`""^pC_3+""^qC_3+""^rC_3`

D

None of these

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The correct Answer is:
B
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