Find the next number in the sequence

1, 2, 6, 21, 88, __?

You stand in front of two doors. A guard stands next to each door. You know the following things: one path leads to paradise, the other leads to death. You cannot distinguish between the two doors. You also know that one of the two guards always tells the truth and the other always lies. You have permission to ask one guard one question to discover which door leads to paradise. What one question would you ask to guarantee you enter the door to paradise?

A train leaves from point A for point B at 80 mph. After half an hour, another train leaves from point B for point A at 60 mph.

Which of the trains will be farther from point A when they meet ?

Replace the (?) with the correct mathematical signs to make the expression equal to 59.

18 ? 12 ? 4 ? 5 = 59

John enters a small room. The Door Closes.
When the door opens, John is in a larger room.

Explain?

Whats the next number in the below number sequence pattern.

why number 8549176320 is one of a kind?

Can you circle exactly four of these numbers such that the total is twelve?

1 6 1
6 1 6
1 6 1
6 1 6

How can you leave a room with two legs and return with six legs?

Can you decipher the following common phrase?

T M C
A U O
H S M
W T E