Consider the statements and conclusions and decide which conclusions logically follow. Statements: All rocks are minerals. All minerals are ores. Conclusions: 1. All rocks are ores. 2. All minerals are rocks.
AOnly conclusion 2 follows.
BOnly conclusion 1 follows.
CBoth conclusions follow.
DNo conclusion follows.
Answer & Solution
Correct answer: B. Only conclusion 1 follows.
1. From 'all rocks are minerals' and 'all minerals are ores', the chain gives all rocks are ores, so conclusion 1 follows.
2. Conclusion 2 reverses 'all minerals are rocks', which is not implied by the premises.
3. Hence only conclusion 1 follows.
_Source: RRB Group D CEN-02/2018 PYQ, Q.10._
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