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Let X = x 5 y and 1 20 y 8 x : ) y , x ( 2 2 2 Z Z . Three di stinct points P, Q and R are randomly chosen from X . Then the probability that P, Q and R form a triangle whose area is a positive integer, is
- 220 71
- 220 73
- 220 79
- 220 83
Correct answer: 220 73
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