First slide

Combinations

Question

There are two parallel lines, one having 10 points and the other having 5 points. The number of triangles formed with vertices as these points is

Easy

A

225
B

100
C

325
D

125

Solution

answer_{$=^{15} c_{3} -^{10} c_{3} -^{5} c_{3} = 325$}

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