Write the next letter in this sequence.
O, T, T, F, F, S, S, E, __
**Hint: It is a Number Series Puzzle

How can you tell a raw egg from a hard-boiled egg?

I am white when I am dirty, and black when I am clean. What am I?

Can you identify the Oscar-winning movie from the rebus below?

The chance of Mr John winning the lottery is 10%. All participants lined up and Mr John is 4th in the row. The first three participants lose the lottery.

What is the chance of Mr John now?

In the picture that is attached with this question, you can find a square which comprises of four little squares inside it. Consider this square to be made with matchsticks. You have to remove two matchsticks such that only two squares remain instead of five.How will you do it ?

Can you find the thief by just looking at the picture below?

I add 5 to 9 and get 2. The answer is correct, so what am I?

A certain street contains 100 buildings. They are numbered from 1 to 100. How many 9's are used in these numbers?

Solve below rebus puzzle?