how to solve binary logic question ?

is it like trail and error method ?
but that will take a lot of time if there are many statements.

Hi Sampath, could you elaborate on the question? What kind of binary logic questions do you have in mind.

One model of binary logic questions that appear in CAT is about true / false / alternating statements.

In this type of questions, generally there are three persons, and one of them is a truth-teller, one is a liar and the third is an alternator. To solve this type of questions, assume that the first person is a truth-teller, and check for the consistency of the other statements. If they are not consistent, assume that the second person is the truth-teller and check for the consistency of the other statements, and so on. This way, all the possibilities can be listed.