Question 21
MediumOriginal questionAssume the statements are true.
Statements: No lake is a pond. Some ponds are wells.
Which one of the following conclusions definitely follows?
Show the answer and explanation
Correct answer: C
Explanation
The wells that are ponds cannot be lakes, since no pond is a lake. So some wells are not lakes: this follows.
Wells that are not ponds are unrestricted, so they may or may not be lakes. 'No well is a lake' and 'Some lakes are wells' are only possible.
Every lake could lie inside the part of the well circle that is not a pond, so 'Some lakes are not wells' is not certain either.
Only 'Some wells are not lakes' definitely follows.
Worth noting
In No + Some, the Some-not conclusion always starts from the group in the Some statement that is not in the No statement.
- Concept
- No + Some gives Some … not
- Typical timeTypical
- 70 s
- Your timeYours
- —
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