Skip to main content

Answers to the most common puzzles in Interviews PART-3

Here are the answers for my last post of Common puzzles in Interviews.


1. Planes will not collide if they all move in same direction (Clockwise or AntiClockwise). So each plane has 2 choice , either clockwise or anticlockwise. So for all the planes we will have 2^5  possibilities.

Below are the possibilities for all five planes where C denotes Clockwise and A denotes AntiClockwise

CCCCA
CCCAA
CCAAA
:
:
:
:
CCCCC
:
:
:
AAAAA
:
:
AAAAC

So in all we have 32 possibilities and out of those 32 only 2 possible combination (AAAAA & CCCCC) will not result into collision.

So probability of planes not getting collide is 2/32 = 1/16.

2. The next number in series is 23.

2 11 -> 2+(1+1) = 4
4 15 -> 4+(1+5) = 10
10 13 -> 10+(1+3) = 14
14 18 -> 14+(1+8) = 23

3. So in one day the net time increased is 1/2 - 1/3 = 0.17 minutes .
Clock will become 5 minutes faster in
0.17 * days = 5
days = 5/0.17 = 29.4 days ~ 30 days.
So the date will be 30th of May.

4 . The next number in series is 256
1/5 -> 5^1 = 5
3/6 -> 3^6 = 216

Similarly, 4^4 = 256

5. Singapore is 10 hours behind brazil and dubai is 6 hours behind brazil. So Dubai is 4 hours ahead of Singapore.

So if you travelled for 6 hours , you will reach dubai at 15:00 PM dubai time.

After that you travel for 15 hours 15 minutes to Brazil , so you will reach brazil at 12:15 PM next day brazil time.

Please let me know in comments if you have different answers or approach.

Labels:

Comments

Post a Comment

Popular posts from this blog

Tricky Questions or Puzzles in C ( Updated for 2026)

Updated for 2026 This article was originally written when C/C++ puzzles were commonly asked in interviews. While such language-specific puzzles are less frequent today, the problem-solving and logical reasoning skills tested here remain highly relevant for modern Software Engineering, Data Engineering, SQL, and system design interviews . Why These Puzzles Still Matter in 2026 Although most Software &   Data Engineering interviews today focus on Programming, SQL, data pipelines, cloud platforms, and system design , interviewers still care deeply about how you think . These puzzles test: Logical reasoning Edge-case handling Understanding of execution flow Ability to reason under pressure The language may change , but the thinking patterns do not . How These Skills Apply to Data Engineering Interviews The same skills tested by C/C++ puzzles appear in modern interviews as: SQL edge cases and NULL handling Data pipeline failure scenarios Incremental vs ...
23 comments
Read more

Programs and Puzzles in technical interviews i faced

I have attended interview of nearly 10 companies in my campus placements and sharing their experiences with you,though i did not got selected in any of the companies but i had great experience facing their interviews and it might help you as well in preparation of interviews.Here are some of the puzzles and programs asked to me in interview in some of the good companies. 1) SAP Labs I attended sap lab online test in my college through campus placements.It had 3 sections,the first one is usual aptitude questions which i would say were little tricky to solve.The second section was Programming test in which you were provided snippet of code and you have to complete the code (See Tricky Code Snippets  ).The code are from different data structures like Binary Tree, AVL Tree etc.Then the third section had questions from Database,OS and Networks.After 2-3 hours we got the result and i was shortlisted for the nest round of interviews scheduled next day.Then the next day we had PPT of t...
4 comments
Read more

Decorators in Python

Decorators provide additional functionality to the functions without directly changing their definition of them. Basically, it takes the functions as an argument, adds functionality to them, and returns it.  Before diving deep into the concept of Decorators, let's first try to understand  What are functions in Python and what is an inner function? In Python everything is Objects, be it Class, Variables, and Functions . So functions are python first-class objects that can be used or passed as an argument. You can store the functions in variables, you can pass a function to another function as parameters, and you can also return the function from the function. Below is one simple example where we are treating functions as objects . def make_me_lowercase ( str ): return str .lower() print (make_me_lowercase( "HELLO World" )) copy_of_you = make_me_lowercase print (copy_of_you( "HELLO World" )) The output of the above calls for both the functio...
2 comments
Read more