Remember in GATE each question will have four choices for the answer, only one is correct and wrong answer carry 33% negative marks
Read the question (without reading choices) very carefully.
Mark important key words and look for special key words like not, but, except , or, nor, always, never, and only . Mark these key words. E.g.
Ques The number of leaf nodes in a rooted tree of n(n>0) nodes, with each node having 0 or 3 children is:
Important words to mark in this are, "n>0" and "or"
The number of leaf nodes in a rooted tree of n(n>0) nodes, with each node having 0 or 3 children is:
Many times we miss words like "or" and whole question in changed.
If you can think of answer before reading choices, keep it in mind before reading choices
Compare with choices and select the best suited answer.
Most of times choices are made to confuse. If there are two or more options that could be the correct answer, compare them to each other to determine the differences between them.
If there is an encompassing answer choice, for example "all of the above", and you are unable to determine that there are at least two correct choices, select the encompassing choice.
Make educated/intelligent guesses - eliminate options any way you can.
Multiple choices can provide direct short cut to get correct answer, especially in numerical problems. For example in the above question.
