Answer: 120.
- A 90
- B 120
- C 210
- D 720
Correct answer: B. 120
Explanation: Any 3 points form a triangle. 10C3 = 120.
Counting tree for selecting 2 items from {A, B, C} without repetition: 3 x 2 = 6 ordered arrangements.
Concept context
Counting, arrangements, and selections