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Complete the missing letters of the given word.

Can you find the missing letter in the sequence?
S - T - I - L - ? - T - F - Y - C

Two boys were admitted to a school. When the headmaster asks them about their parents, they tell him that they have same parents (father and mother). On further inquiry, it turns out that they both share the same date for their birthday.

"Are you twins," ask the headmaster.
"No," replies the boys.

Is it possible?

How can you drop a raw egg from a height onto a concrete floor without cracking it?

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

There are three boxes. One is labeled "APPLES" another is labeled "ORANGES". The last one is labeled "APPLES AND ORANGES". You know that each is labeled incorrectly. You may ask me to pick one fruit from one box which you choose.

How can you label the boxes correctly?

This is a famous paradox which has caused a great deal of argument and disbelief from many who cannot accept the correct answer. Four balls are placed in a hat. One is white, one is blue and the other two are red. The bag is shaken and someone draws two balls from the hat. He looks at the two balls and announces that at least one of them is red. What are the chances that the other ball he has drawn out is also red?

Our product and our sum always give the same answer. Who are we?

Can you count the number of lines in the below picture?

What is the largest amount of money that you can possess in change and still if someone asks you for a dollar, you won't be able to give?