I am white when I am dirty, and black when I am clean. What am I?

There is a box in which distinct numbered balls have been kept. You have to pick two balls randomly from the lot.

If someone is offering you a 2 to 1 odds that the numbers will be relatively prime, for example
If the balls you picked had the numbers 6 and 13, you lose $1.
If the balls you picked had the numbers 5 and 25, you win $2.

Will you accept that bet?

Solve the riddle below:

If a Chicken says, 'All chickens are liars" is the chicken telling the truth?

What is so fragile that saying its name breaks it?

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

If you toss a coin 10 times and it lands heads up every time, what are the chances it will land heads up if you toss it again?

A bus driver was heading down a street in Mexico. He went right past a stop sign without stopping, he turned left where there was a "no left turn" sign, and he went the wrong way on a one-way street. Then he went on the left side of the road past a cop car. Still - he didn't break any traffic laws. Why not?

If I remove one from eleven it becomes Ten and if I remove one from nine also becomes Ten. How?

A tourist visits a small town for his research. While in the town, he decides to get a haircut. Since the town is quite small, there are only two barbers in the town � one on the North Street and one on the South Street. The barbershop on the North Street is a mess and the barber has a weird and pathetic haircut. While the barbershop at the South Street is pretty tidy and the barber as well has an impressive haircut.

Which barbershop will the tourist visit for his haircut and why?

what's the probability of getting a king or a queen from a pack of 52 cards?