Discussion
P, Q, and R talk about S’s car collection. P states that S has at least 3 cars. Q believes that S has less than 3 cars. R indicates that to his knowledge, S has at least one car. Only one of P, Q and R is right. The number of cars owned by S is
Answer: A
S owns 0 cars.
Test each possibility against "only one of P, Q and R is right".
- 0 cars: P (at least 3) is wrong, Q (less than 3) is right, R (at least one) is wrong. Exactly one is right.
- 1 or 2 cars: Q and R are both right, which is two.
- 3 or more: P and R are both right, again two.
Only 0 satisfies the condition, so the number is determined, ruling out "cannot be determined"; 1 and 3 each make two people right.
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