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Two statements are given followed by two conclusions numbered I and II. Assuming the statements to be true, even if they seem to be at variance with commonly known facts, decide which of the conclusions logically follow(s) from the statements. Statements: All machines are refrigerators. All refrigerators are geysers. Conclusions: I. Some machines are not geysers. II. Some geysers are machines.

Two statements are given followed by two conclusions numbered I and II. Assuming the statements to be true, even if they seem to be at variance with commonly known facts, decide which of the conclusions logically follow(s) from the statements. Statements: All machines are refrigerators. All refrigerators are geysers. Conclusions: I. Some machines are not geysers. II. Some geysers are machines. Correct Answer Only conclusion II follows.

Statements:

All machines are refrigerators.

All refrigerators are geysers.

The least possible diagram for the given statements is as follows

Important Points

Conditions of Either-or case:

1. Individually both the conclusions should be false.

2. One conclusion should be positive and one conclusion should be negative (Complementary pair)

The two complementary pairs are:

1) All + Some not

2) No + Some

  • Some + Some not - It is not a complementary pair.

Related Questions

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