X#-Y-X∇Y=38, then which of the following must be true?
Explanation:
The best possible way to solve this is to check each of the given answer choices. In options (a), (c) and (d), either both X and Y are positive or both X and Y are negative.
Since we have (–Y) in the numerator of our expression and (–X) in the denominator, X and Y will never be both positive and neither will XY be positive.
Hence, both the numerator and the denominator of our expression will be 1 and the value will always be 1.
Hence, the only possible answer choice is (b).
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