As easy as X-Y-Z

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As easy as X-Y-Z

QOD2015_0302
Explanation
Statement (1) Since the three points are distinct, yz > 0. xy = xy + yz − yz = 50 − yz. We can see that xy < 50. This statement is sufficient.

The correct answer would be between A/D.

Statement (2) xy could have any value > 0. This statement alone is insufficient.

The correct answer is A.