What is the next number in this series?

4,12,84,3612....

They are three errirs in this question. Can you find them?

In the below-given picture of a pretty girl, there is something wrong. Can you find out what it is?

What is greater than gold but cannot be bought. it can never be sold and can earn if its sought. though it can be broken, it can still be fixed. for by birth it can't start nor by death it is ended.what am i?

John is asked to stand behind Jacob and Jacob is asked to stand behind John. Both of them feel confused about it and don't know what to do?

But it is quite possible, do you know how?

If you drop me I’m sure to crack, but give me a smile and I’ll always smile back. What am I?

You have a three-gallon and a five-gallon measuring device. You wish to measure out four gallons.

Look at the below sequence of letters and tell us what the next letter should be:

O T T F F S S ?

A chess tournament is taking place on knock-out terms (the one who loses the match is out of the game).
(a) If 10 matches are played in total, how many players participated?
(b) If 20 players took part in the tournament, how many matches were played?

1. Where does Easter come from before Valentine's Day?

2. Do you know what is in the middle of Valentine's?

3. What did the lady bee say to the man bee on the occasion of Valentine's Day