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2026
There are four statements X, Y, Z and W. Their relations are as follows: If X is incorrect, then so is Z; if Y is incorrect, then W is correct; if W is correct, then X is incorrect. Which of the following is/are correct? I. If X is correct, then so is Y. II. If Z is correct, then it is not necessary that Y is correct. Select the answer using the code given below.
Explanation
If X is correct, then from "if W is correct, then X is incorrect," W must be incorrect; hence, Y must be incorrect (since if Y is incorrect, W is correct). Therefore, if X is correct, Y must also be correct. On the other hand, if Z is correct, it does not influence Y directly, so Y may or may not be correct, making statement II valid. Thus, only statement I is definitely true.
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