10 points are marked on a straight line and 11 points are marked on another straight line. How many triangles can be constructed with vertices from among the above points?

Question

anonymous · Answer

This problem is from combinations, right?? @pathfinder_007

anonymous · Answer

yes but i don't know how to start. i m stuck

anonymous · Answer

ok we should know that to form a triangle we can select 2 points from first line and 1 point from second line or select one point from first and 2 points from second line...
right??

anonymous · Answer

yes true )

anonymous · Answer

ok so this can be done in
$$10C _{2} *11C _{1} +10C _{1}*11C _{2}$$
calculate.

anonymous · Answer

yes i got it, thank u @aryandecoolest  it's 1045

anonymous · Answer

pleasure :)