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

O T T F F S S ?

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

John replied, when asked how old he was. In 2 years he will be twice as old as he was five years ago.' How old is he ?

Samuel was out for a walk when it started to rain. He did not have an umbrella and he wasn't wearing a hat. His clothes were soaked, yet not a single hair on his head got wet. How could this happen?

You can find some missing letters in the picture. By placing two particular letters in the spaces, you can form a nine lettered word beginning from one of the corners and going clockwise direction to the middle. Can you find out the letters and the word?

Find the value of "?" in the ball picture Riddle below:

You need to move three matchsticks to form three squares. Can you do it?

Can you figure out the logic I used to decide the order of the following words:
gun, shoe, spree, door, hive, kicks, heaven, gate, line, den

What's the next in the series?

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

One day, I thought of ways that can be used for creating a palindrome. So I decided that I will turn into a larger number by adding the reversed digits to the original number and keep doing it till I finally obtained a palindrome.

I am not sure if this process will always result in a palindrome eventually but I was able to produce a four-digit palindrome. Can you guess my starting number?