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Statements: Some cats are dogs. All dogs are birds. No bird is a stone. Conclusions: I. Some cats are birds. II. No dog is a stone. III. So…

1007Medium DSSSB TGT Computer Science 0 replies 1 views
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Statements: Some cats are dogs. All dogs are birds. No bird is a stone. Conclusions: I. Some cats are birds. II. No dog is a stone. III. Some cats are not stones. IV. All cats are birds. Which of the conclusions follow?

  • AOnly I and II
  • BOnly I and III
  • CI, II and III only
  • DAll four
Correct answer: C

Explanation

I follows from "some cats are dogs" and "all dogs are birds"; II from "all dogs are birds" and "no bird is a stone"; III from I and "no bird is a stone"; IV does not follow.
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