There are two parallel lines L1 and I2 ...

There are two parallel lines `L_1 and I_2` in a plane `I_1` contains mdifferent points nand lcontains n different points `A_1,A_2,.........,A_m and I_2` contains n different points `B_1,B_2,......B_n`. How many triangles are possible with thesevertices?

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The correct Answer is:

`"^(m+n)C_(3)-"^(m)C_(3)-"^(n)C_(3)` or`"^(m)C_(2)"^(n)C_(1)+"^(m)C_(1)"^(n)C_(2)`

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