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Discussion

Statements: All men are vertebrates. Some mammals are vertebrates.

Conclusions:

1. All men are mammals.

2. All mammals are men.

3. Some vertebrates are mammals.

4. All vertebrates are men.

  • A.Only (4)
  • B.Only (2)
  • C.Only (3)
  • D.Only (1)

Answer: C

Correct answer: Only (3)

Some mammals are vertebrates gives its converse, some vertebrates are mammals. The other three try to link men with mammals, and the only connection is through vertebrates as a predicate in both statements - an undistributed middle, which proves nothing.

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