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Statement: All keys are locks. Some locks are doors. Conclusion (i): Some keys are doors. (ii): All locks are keys.
AOnly (i)
BOnly (ii)
CBoth
DNeither
Answer & Solution
Correct answer: D. Neither
1. (i): All keys ⊆ locks; some locks are doors but those may not include keys. Doesn't follow.
2. (ii): 'All keys are locks' doesn't reverse to 'all locks are keys'. Doesn't follow.
3. Neither follows.
_Source: jkchrome Statement-Conclusion, p.5 — multi-clause invalid_
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