GATE EC 2017 Set 2 — Question 58
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General Aptitude → Analytical Aptitude → Deduction & Induction
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Question
A rule states that in order to drink beer, one must be over years old. In a bar, there are people. is years old, is years old, is drinking milkshake and is drinking a beer. What must be checked to ensure that the rule is being followed?
Correct answer
(B) Only P 's drink and S 's age
Solution
The rule is a conditional statement: If a person is drinking beer, then they must be over years old ().To verify if this rule is being followed, we must check:
1.The Antecedent (): Anyone who is drinking beer must be checked to see if their age is . Person is drinking beer, so we must check 's age.
2.The Contrapositive (): Anyone who is not over () must be checked to see if they are not drinking beer. Person is years old (), so we must check 's drink.
Other cases:- Person is years old (). The rule is satisfied regardless of what they drink.
- Person is drinking milkshake (not beer). The rule is satisfied regardless of their age.
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