Find the Next Number in the Sequence

2 9 3 1 8 4 3 6 5 7 ?

What will you call your mother's brother's brother-in-law?

An American nightclub called 'The Coconut Grove' had a terrible fire in which over 400 people died. A simple design flaw in the building led to a high death toll. Subsequently, regulations were changed to ensure that all public buildings throughout the country eliminated this one detail, which proved deadly. What was it?

How much will a 38° angle measure when looked at under a microscope that magnifies ten times?

I can be cracked, made, told, and played. What am I?

Why did Buffon take the goal with him after every Juventus match?

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

Suppose you are sitting in an interview and the interviewee asks you an aptitude question.

You have three buckets with a capacity of 4 litres, 8 litres and 10 litres and you have a large tank of water. Now you have to measure 3 litres of water precisely using those buckets. How will you do it?

Rearrange the letters in "new door" to make one word.

How many pluses should we put between the digits of 987654321 to get a total of 99, and where?