I’ll like to stress that objective paper solving is different from subjective paper. You don’t need to study extra for objective questions but practice little bit.
Your guess in solving objective can bring you in difficulty but some intelligent/educated guess can add valuable marks to your score. Most of time objective questions have some hint in the form of multiple choices for the question.
Following can be used as guidelines for solving objective paper:
General Tips
Multiple Choice Specific Tips
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.
Example
The number of leaf nodes in a rooted tree of n(n>0) nodes, with each node having 0 or 3 children is:
Choices:
A n/2
B (n-1)/3
C (n-1)/2
D (2n+1)/3
Direct solving the problem can be difficult. Use following short cut.
Imagine few such trees and try to get answer from choices. Lets start with tree with one node, i.e. n = 1. In this case obviously number of leaves should be one(same as root). Putting n=1 in above options only option "D" gives 1. But assure your self with more tries. Next possible value of n = 4 with number of leaves = 3. Putting this is multiple choices only "D" satisfies confirming our solution.
I’ll try to include more examples to understand different tricks as and when I get time. But you can always reach me at gate.tutor@gmail.com. I’ll try to solve your problems. I’ll also recommend student to send their tricks/suggestions so that they can be included in this page. I’m looking for contributions from you all to make this page useful for all student appearing in GATE.