Can you solve below mathematical equation?

2^1234 - 2^1233

I have a hole in my back and legs I lack.
I live where I can’t breathe and I eat without teeth.
What am I?

Can you tell a 3D object that has just two surfaces?

A rubber ball keeps on bouncing back to 2/3 of the height from which it is dropped. Can you calculate the fraction of its original height that the ball will bounce after it is dropped and it has bounced four times without any hindrance ?

What is full of holes but still holds water?

The first box has two white balls. The second box has two black balls. The third box has a white and a black ball.

Boxes are labeled but all labels are wrong!

You are allowed to open one box, pick one ball at random, see its colour and put it back into the box, without seeing the colour of the other ball.

How many such operations are necessary to correctly label the boxes?

Sally lives in a place where six months of the year is mild summer and the temperature drops significantly the other six months. She owns a lake where there is a small island. She wants to build a house on the island and needs to get materials there. She doesn’t have a boat, plane, or anything to transport them to the island. How does Sally solve this problem?

You can see three almost identical images below. Can you spot the odd one out from them?

Make the seating arrangement of 10 children in such a way that there are 5 rows with 4 children in each row.

Look at this sequence from top to bottom. What is the next number in the sequence?
1
11
21
1211
111221
312211