Logical Reasoning Q.121

0. Which of the following are the correct ways of arguing?
I. There can be no second husband without a second wife.
II. Anil is a friend of Bob, Bob is a friend of Raj, hence Anil is a friend of Raj.
III. A is equal to B, B is equal to C and hence, A is equal to C.
IV. If everyone is a liar, then we cannot prove it.
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