There is a box full of marbles,
all but two are blue,
all but two are green,
and all but two are red.

How many marbles are in the box?

An infinite number of mathematicians are standing behind a bar. The first asks the barman for half a pint of beer, the second for a quarter pint, the third an eighth, and so on. How many pints of beer will the barman need to fulfill all mathematicians' wishes?

What occurs twice in a week, once in a year but never in a day?

You have a thousand Re. 1 coins with you. You have ten bags with you and you can put any number of coins in each of the bags. The condition is that if someone asks you for any amount between 1 and 1000, you must be able to give that amount by just giving the bag (you are not allowed to open the bag and give coins).

How will you do it?

Which tank will fill first?

Which part of London exists in France as well ?

2, 3, 5, 9, 17, _ What is the next number in the sequence?

I am lying and I always lie. Tell me whether I am lying or telling the truth.

You can see three almost identical images below. Can you spot the odd one out from them?

I have branches, but no fruit, trunk or leaves. What am I?