Find the Next Number in the Sequence

2 9 3 1 8 4 3 6 5 7 ?

Buy me, smell me or deliver me, I do not change.

Who am I?

The dirtier I get, the whiter I look. Who am I?

It begins where the time ends.
Its second is an expression of surprise.
Its third is a question.
Its fourth is urinate.
It ends with a drink.

Which country it is?

Can you solve this picture maths equation?

Find the next number in the sequence

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

Solve the following series:
AZ, GT, MN, __, YB

A man is surviving on an island along with his friend. They have been starving for four days for food. Suddenly, they find a fisherman. The friend goes with the fisherman in order to catch the fish (if they can find any).

The fisherman returns after some time but he is alone and has some salmon that he had prepared. When asked, the fisherman tells him that his best friend fell off the boat and drowned in the water. Starving for so long, he eats the meal while crying for his friend.

After being rescued, he goes to a diner and orders salmon. When he eats his meal, he jumps and commits suicide. Why did he do it?

Can you solve the maths in the below-given picture equation?

Why do you find that most of the buildings are deprived of the 13th floor?