What does does this rebus picture means ?

I have some blue and red sock in my drawer. I have a total of 4 socks. I pick 2 socks and the chance that I get a pair of red socks is 1/2.

What is the chance of picking a pair of blue socks?

What does the below rebus riddle means?

Seven Robbers robbed a bank and hide the coins in a lonely place.
They decide to divide the money equally the next morning. Two greedy robbers decided to cheat the others and reach the place at night. They equally divided the coins between them, one coin left. So they called another robber and then they decided to divide equally among the three. Sadly again one coin left. The same thing happened to the 4th 5th and the 6th robber.
However, when the 7th robber reached in the morning, they can divide the coins equally.

How many coins were there in total?

Forwards I am heavy, backward I am not. What am I?

Find out the number of circles in the given picture having Illusion

You knock a Table over in the library, and suddenly 20 eyes are looking at you.

10+10 and 11+11 can give you the same answer.

Explain how?

What is the largest number you can write with just 3 digits?

What does this rebus riddle means ?