top button
Flag Notify
    Connect to us
      Facebook Login
      Site Registration Why to Join

    Get Free Puzzle Updates

Facebook Login
Site Registration

Which two keys can’t open any doors?

0 votes
690 views
posted May 13, 2014 by Swati Arora

Share this puzzle
Facebook Share Button Twitter Share Button Google+ Share Button LinkedIn Share Button Multiple Social Share Button

2 Solutions

0 votes

Monkey & Donkey can't open the doors

solution May 13, 2014 by Kunal Shah
0 votes

Lucky and risky cant open any door.

solution Jun 19, 2014 by Binu Mon



Similar Puzzles
0 votes

Whilst my body is usually made from wood,
I have keys that don't unlock doors,
and a bell that does not ring.
Moreover, I cannot speak without the help of a single piece of cane.

What am I?

0 votes

There are 100 doors in a row, all doors are initially closed. A person walks through all doors multiple times and toggle (if open then close, if close then open) them in following way:

In first walk, the person toggles every door.

In second walk, the person toggles every second door, i.e., 2nd, 4th, 6th, 8th, …

In third walk, the person toggles every third door, i.e. 3rd, 6th, 9th, …

………
……….

In 100th walk, the person toggles 100th door.

Which doors are open in the end?

Contact Us
+91 9880187415
sales@queryhome.net
support@queryhome.net
#470/147, 3rd Floor, 5th Main,
HSR Layout Sector 7,
Bangalore - 560102,
Karnataka INDIA.
QUERY HOME
...