100 prisoners are stuck in the prison in solitary cells. The warden of the prison got bored one day and offered them a challenge. He will put one prisoner per day, selected at random (a prisoner can be selected more than once), into a special room with a light bulb and a switch which controls the bulb. No other prisoners can see or control the light bulb. The prisoner in the special room can either turn on the bulb, turn off the bulb or do nothing. On any day, the prisoners can stop this process and say "Every prisoner has been in the special room at least once". If that happens to be true, all the prisoners will be set free. If it is false, then all the prisoners will be executed. The prisoners are given some time to discuss and figure out a solution. How do they ensure they all go free?

Can you spot the man between the coffee bean in the picture below ?

Can you solve the below algebraic mathematical equation?

(J+O+I+N+T)3 = JOINT

John was a very careless driver, so his owner Jacob gave him an offer that he will get an incentive of Rs.30 for every bottle box he delivered without breaking it and he will be charged Rs.90 for every bottle box he broke. Jacob gave John 100 bottles-box to deliver. After delivery, Jacob paid John Rs.2400. How many bottles-box did John break?

Why is it very easy to weigh a fish?

What three numbers, none of which is zero, give the same result whether they’re added or multiplied?

It is always ahead of me yet I can never see it. What is it?

My location can be determined by the below rebus.
So where am i ?

I throw two dice simultaneously.

What is the probability of getting a sum as 9 of the two numbers shown?

I was speeding and ran through a stop sign, yet two traffic officers who were there do nothing about it.

why?