Replace the question mark with the correct number, given the pair of numbers exhibits a similar relationship?

? : 3839 :: 11 : 1209

Which word is least like the others? Third, fourth, fifth, sixth, seventh, eighth, ninth?

There are two guys standing face to face in a room. On a wall, there is a clock. One of those is a prophet. He tells the other guy that he will be stabbed in the back in five minutes.

Shocked to hear that, the other guy stares at the clock. Just after the five minutes, he is stabbed on the back. Can you tell what happened?

Can you make a six-letter word using the letters N, A and B ?

Which number comes next in the number series?

2, 9, 30, 93, ?

What mathematical symbol can be put between 5 and 9, to get a number bigger than 5 and smaller than 9?

John named his first son Alpha, second Beta, third Charlie and fourth Delta. What is the fifth son's name?

There is an English word that can be used up to four times in a row without modifying the spelling and form a valid grammatical sentence.

Do you know what word is that?

Can you decipher these quotes by Albert Einstein?
Blf xzm mvevi hloev z kilyovn lm gsv ovevo lm dsrxs rg dzh xivzgvw.

Three doctors said that Bill was their brother. Bill says he has no brothers. How many brothers does Bill actually have?