Direction: Each of these questions is followed by two statements, I and II. Mark the answer as
1. if the question can be answered with the help of statement I alone. 2. if the question can be answered with the help of statement II alone. 3. if both statement I and statement II are needed to answer the question. 4. if the question cannot be answered even with the help of both the statements.
If x, y and z are real numbers, is z – x even or odd?
I. xyz is odd. II. xy + yz + zx is even.
Explanation:
Statement I suggests that xyz is odd. This is only possible if all three of them are odd. Hence, z – x is even. So only statement I is required to answer the question.
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