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Some tapes are discs. Some discs are cassettes. Some cassettes are songs Conclusions: 1. Some songs are discs 2. Some cassettes are tapes 3. Some songs are tapes 4. No song is a disc

Only either 1 or 4 follows
Only either 2 or 4 follows
Only 3 and 4 follow
Only 3 and either 2 or 4 follows

Correct Answer: Only either 1 or 4 follows

Explanation:

Since each combiantion of premise contain 2 particular premises, no definite conclusion can be drawn. However, 1 and 4 involve the extreme terms of 2nd and 3rd premises and form a complementary pair. Thus either 1 or 4 follows.

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