Final answer:
To confirm the rule "If a card has a vowel on one side, it must have an even number on the other side," in Wason's 4 card task, you need to flip over the letters U to check for an even number and 3 to ensure there's no vowel on the other side, making option a) U and 3 the correct answer.
Step-by-step explanation:
The question is based on the Wason's 4 card task, which is a logic puzzle designed to test an individual's ability to apply conditional reasoning. In this task, the rule to confirm is: "If a card has a vowel on one side, it must have an even number on the other side." To test this rule, you need to choose which two cards to flip over.
You should flip over the U card because if the rule is true, the other side must be an even number. You should also flip over the 3 card because if the rule is true, the other side cannot be a vowel; if it is a vowel, the rule is disproven. The correct answer to the question is therefore option a) U and 3. Flipping the 8 does not necessarily prove or disprove the rule because an even number could have a vowel or consonant on the other side without violating the rule. The K doesn't need to be flipped because the rule does not state anything about what happens if there's a consonant on one side.