Statements: All locusts are insects. All insects are worms. Conclusions: 1) All locusts are worms. 2) All insects are locusts. Which conclusion(s) logically follow?
AAll the conclusions follow
BOnly conclusion 1 follows
COnly conclusion 2 follows
DNo conclusions follow
Answer & Solution
Correct answer: B. Only conclusion 1 follows
1. From 'All locusts are insects' and 'All insects are worms', locusts fall within worms.
2. So conclusion 1 (All locusts are worms) validly follows.
3. Conclusion 2 reverses a universal claim, which is not valid.
4. Hence only conclusion 1 follows.
_Source: RRB Group D CEN-02/2018 PYQ, Q.71._
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