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

What's the next in the series?

H, Be, F, S, Mn, Kr, In, Gd, Tl, ?

You need to arrange three 7 and mathematical symbols to form number 1?

When my father was 31 I was 8. Now he is twice as old as me. How old am I?

There was a blind beggar living on the footpath of a street. Suddenly one day, the beggar's brother died. What was the relation of the blind beggar with the person who died?

PS: Brother is not the answer.

If an electric train is travelling south, then which way is the smoke going?

They came out at night, without being called.
They lost at day, without being stolen.
Who are they?

While preparing the table for dinner, wife came up with an idea to tease his mathematician husband. She asked her husband to pick nine toothpicks and make ten without breaking any toothpick.

The husband was also smart and did it within seconds. How ?

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.

John enters a small room. The Door Closes.
When the door opens, John is in a larger room.

Explain?