Which word does the below Plexor means ?

There was a blind man. He had four socks in his drawer either black or white. He opened it and took out two socks. Now the probability that it was a pair of white socks is 1/2.

Can you find out the probability that he had taken out a pair of black socks ?

What does below rebus means ?

The product of three consecutive numbers is 7980.
Then the sum of these consecutive numbers would be?

Can you find out what is missing?

1 3 5
2 4 ?

Hint: It's not six. Think out of the box.

A pond had 60 fish, out of which, all but 20 died.
How many fishes are now present in that pond?

There are 2 people near the river and both of them want to get on the other side. The boat can only take one of them. But they got across.
How?

What is full of holes but still holds water?

I always drive my customer away.

Who am I?

You are trapped into a death trap by the famous jigsaw killer. As usual, a screen flashes in front of you and explains you the trap game. There are 100 pearls kept in a bowl in front of you and an empty bowl. Among the 100 pearls, 50 are white and 50 are black. You can divide them as you like into the two bowls. Once you are done, you will pull a lever, which will turn the room pitch black. The bowls will move and shuffle around. In the dark, you have to pick up one pearl from any bowl. Once you do that, the room will flood with lights again. If the peral you have in your hand is white, you will be allowed to live, but if the pearl you picked is black, the room will be filled with poisonous gas and you will die. How will divide the pearls to increase your chances of survival?