Pronounced as one letter,
And written with three,
Two letters there are,
And two only in me.
I am double, I am single,
I am black blue and grey,
I am read from both ends,
And the same either way.

Can you calculate the probability of getting a sum of six when a dice is thrown twice?

Can you find a number that lies one third of the distance between 1/3 and 2/3?

John named his first son Alpha, second Beta, third Charlie and fourth Delta. What is the fifth son's name?

Do you know of a place where the wind blows south and then suddenly shifts direction towards the north?

If you were to put a coin into an empty bottle and then insert a cork into the neck, how could you remove the coin without taking out the cork or breaking the bottle?

What animal walks on four legs in the morning, two legs during the day, and three legs in the evening?

Oedipus, the king of Thebes, figured out the answer to the riddle:

What does this rebus mean?

O
N
C
E
TIME

Can you count the number of matches in the picture below ?

I never was there, I am always to be.
You have never ever seen me, not ever you will.
Yet I am the confidence of everyone.

Who Am I?