Find the Next Number in the Sequence

2 9 3 1 8 4 3 6 5 7 ?

This is a most unusual paragraph. How quickly can you find out what is so unusual about it? It looks so ordinary, you'd think nothing was wrong with it. Actually, nothing IS wrong with it. But it is not as ordinary as you might think. If you think about it for a bit, you will find out why it is truly so unusual. So what is it? What is so unordinary about this paragraph?

What has 13 hearts but no other organs?

what's the probability of getting a king or a queen from a pack of 52 cards?

If 21x = 79x, what is the value of x?

There are seven sisters in a house in a village where there is no electricity or any gadget.

Sister-1: Reading Novel
Sister-2: Cooking
Sister-3: Playing Chess
Sister-4: Playing Sudoku
Sister-5: Washing clothes
Sister-6: Gardening

what is Sister-7 doing ?

What is common among 11, 69, and 88?

What is the word or phrase?

The doctor advised his patient to take a tablet after every fifteen minutes. He gave him five tablets in total.

How much time will he take to have all the five tablets?

There are nine letters in the below-given diagram. You have to form a nine-letter word using these letters.