1 Answers

Option 3 : I & III

Both of which cannot be true both can also be false

1) I & II

I. All machines make noise

II. Some machines are noisy

Both are true and both cannot be false.

2) III & IV

III. No machine makes noise

IV. Some machines are not noisy

Both are true and both cannot be false.

3) I & III

I. All machines make noise

III. No machine makes noise

Both the statements cannot be true, also, both can be false.

4) II & IV

II. Some machines are noisy

IV. Some machines are not noisy

Both can be true.

Hence, ‘I and III’ is the correct answer.

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