Which conclusion would follow on the basis of the given statements?
Statements:
Some A are B
No B is C
Some C is D
Conclusions:
(I) Some A are D is a possibility
(II) Some A are D
Answer & explanation
Correct answer: option 1
The correct answer is Option (1) → Only I follows
A conclusion follows only if it is true in every diagram that fits the statements. A “possibility” conclusion follows if it is true in at least one such diagram and no statement rules it out.
The statements link A to B, and C to D, but say nothing at all about A and D. A and B overlap, B and C stay apart, and C and D overlap.
In the diagram above A and D do not meet, and every statement is still true. So “Some A are D” is not certain, and conclusion II does not follow.
The circle A could also be drawn to reach D (A and D can share members that are neither B nor C). No statement forbids this, so “Some A are D” is a possibility, and conclusion I follows.