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UGC NET CSE | June 2023 | Part 2: 3

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There are $M$ points on one straight line $A B$ and $n$ points on another straight line $A C$ none of them being $A$. How many triangles can be formed with these points as vertices?

  1. $m n(m+n-2)$
  2. $\frac{1}{2} m n(m+n-2)$
  3. $\frac{1}{2} m n(m+n-1)$
  4. $m n(m+n-1)$
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