Find the Next Number in the Sequence

2 9 3 1 8 4 3 6 5 7 ?

They are three errirs in this question. Can you find them?

Which statement is true out of the following?
One statement here is false.
Two statements here are false.
Three statements here are false.

How will you measure 15 minutes using two hourglasses of 7 minutes and 11 minutes respectively?

When I asked a girl's name she told me her name is the date '07/09/2001'.

I thought for a few seconds and then I got her name. Do you?

You need to climb ten stairs. At every stair, you can either take one step up or you can jump two steps up.

In how many different ways you can climb 10 stairs?

There is a barrel with no lid and some wine in it. 'This barrel of wine is more than half full,' said Curly. 'No it's not,' says Mo. 'It's less than half full.' Without any measuring implements and without removing any wine from the barrel, how can they easily determine who is correct?

A new clothing store has a unique method of pricing items. A vest costs $20, a tie costs $15, a blouse costs $30, and underwear costs $45. How much would pants cost?

One is to three as three is to five and five is to four and four is the magic number.
What is the pattern?

At a party, there are five people and a whole round cake lying at the centre of the table. Only four people will make a cut and take their piece and the last one will get the remaining piece on the table. How can they make sure that everyone gets a 1/5th of the piece?