In this image, you can see three almost identical Doraemon images. Can you spot the odd one out from them?

In Greek mythology, the Sphinx sat outside of Thebes and asked this riddle of all travellers who passed by. If the traveller failed to solve the riddle, then the Sphinx killed him/her. And if the traveller answered the riddle correctly, then the Sphinx would destroy herself. The riddle:

What goes on four legs in the morning, on two legs at noon, and on three legs in the evening?

Oedipus solved the riddle, and the Sphinx destroyed herself.

Prove that twice of ten is the same as twice of eleven.

What does this rebus means ?

You walk into an old horror house. It has no power or plumbing. Once inside, you see three doors. Each door has a number on it. Behind each door is a way for you to die. Behind door number one, you die by getting eaten by a lion. Behind door number two, you die by getting murdered. Behind door number three, you die by an electric chair. You can’t turn back, so you have to go through a door. Which door do you go through?

Which alphabet letter is a question?

Count the number of triangles in the below picture?

What jumps when it walks and sits when it stands?

Find the next number in the series?
2, 12, 36, 80, 150, 252, 392, _ ?

Can you convert the number zero(0) into a positive number using just one mathematical operator ?