A blindfolded man is asked to sit in the front of a carrom
board. The holes of the board are shut with lids in random
order, i.e. any number of all the four holes can be shut or
open.

Now the man is supposed to touch any two holes at a time and
can do the following.

? Open the closed hole.

? Close the open hole.

? Let the hole be as it is.

After he has done it, the carrom board is rotated and again
brought to some position. The man is again not aware of what
are the holes which are open or closed.

How many minimum number of turns does the blindfolded man
require to either open all the holes or close all the holes?

Note that whenever all the holes are either open or close,
there will be an alarm so that the blindfolded man will know
that he has won.

Answers were Sorted based on User's Feedback



A blindfolded man is asked to sit in the front of a carrom board. The holes of the board are shut w..

Answer / guest

The blindfolded man requires 5 turns.

1. Open two adjacent holes.

2. Open two diagonal holes. Now atleast 3 holes are open. If
4th hole is also open, then you are done. If not, the 4th
hole is close.

3. Check two diagonal holes.

o If one is close, open it and all the holes are open.

o If both are close, open any one hole. Now, two holes are
open and two are close. The diagonal holes are in the
opposite status i.e. in both the diagonals, one hole is open
and one is close.

4. Check any two adjacent holes.

o If both are open, close both of them. Now, all holes are
close.

o If both are close, open both of them. Now, all holes are
open.

o If one is open and one is close, invert them i.e. close
the open hole and open the close hole. Now, the diagonal
holes are in the same status i.e. two holes in one diagonal
are open and in other are close.

5. Check any two diagonal holes.

o If both are open, close both of them. Now, all holes are
close.

o If both are close, open both of them. Now, all holes are open.

Is This Answer Correct ?    8 Yes 3 No

A blindfolded man is asked to sit in the front of a carrom board. The holes of the board are shut w..

Answer / shakti

A little correction !
It would be

3. Check two diagonal holes.

o If one is close, open it and all the holes are open.

o If both are open, close any one hole. Now, two holes are
open and two are close. The diagonal holes are in the
opposite status i.e. in both the diagonals, one hole is open
and one is close.

Is This Answer Correct ?    5 Yes 2 No

A blindfolded man is asked to sit in the front of a carrom board. The holes of the board are shut w..

Answer / puzzzzz....

i couldn't understand the above soln. Will someone please
explain the soln. in simple and clear words

Is This Answer Correct ?    2 Yes 0 No

A blindfolded man is asked to sit in the front of a carrom board. The holes of the board are shut w..

Answer / eveline

Hello
My name is eveline i saw your profile today at
www.allinterview.com and i love it also became intrested in
you,i will also like to know you more,and i want you to send
an email directely to my email address so i can give you my
picture for you to know whom i am.Here is my email
address(eveline.mbia@yahoo.com) i believe we can move from
here.my love distance or colour does not matter but love
matters alot in life.i waiting to recive your lovely reply
soon, Yours Love.
Miss Eveline.

Is This Answer Correct ?    1 Yes 1 No

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