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?

Spelt forwards I’m what you do every day, spelled backwards I’m something you hate. What am I?

Which word is least like the others? Third, fourth, fifth, sixth, seventh, eighth, ninth?

You are presented with three boxes. One of them has a red ball inside and the other two have a black ball inside each of them. You are asked to pick up the one with red ball and you pick one. Now, one of the other boxes is opened and it is found to have a black ball.

You are presented with a chance to change your box with the one that is left closed. Will you change your box? Why or why not?

A large container is kept in open under the rain. Every passing hour, the water collected inside the container becomes double what it was.

In ten hours, the container is filled completely. Can you calculate how long would it have taken to be filled in half?

The square root of number 121 is "11". What is the square root of the number "12345678987654321."?

It has a long neck, A name of a bird, Feeds on cargo of ships, It's not alive,

What is it?

What is the largest number you can write with just 3 digits?

Can you name an animal whose killing cannot be performed without spilling your own blood?

Check out the number list below and find what number comes next in the sequence.

111 , 113 , 117 , 119 , 123 , 137 , ?