Which three-digit number, made of consecutive digits, like 567, is 2 less than a cube and 2 more than a square?

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

As easy as you can get into me, it is as hard to get out of me.

Do you know what I am?

I travel all around the world but always stay in the corner. What am I?

I shave every day, but my beard stays the same. What am I?

Which is heavier: a ton of bricks or a ton of feathers?

What is black when you buy it, red when you use it, and gray when you throw it away?

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

Take number 1000 and then add 20 to it.
Now add 1000 one more time.
Now add 30.
Now add 1000 one more time.
Now add 40.
Now add 1000 one more time.
Now add 10.

What is the total?

In a contest, four fruits (an apple, a banana, an orange, and a pear) have been placed in four closed boxes (one fruit per box). People may guess which fruit is in which box. 123 people participate in the contest. When the boxes are opened, it turns out that 43 people have guessed none of the fruits correctly, 39 people have guessed one fruit correctly, and 31 people have guessed two fruits correctly.
How many people have guessed three fruits correctly, and how many people have guessed four fruits correctly