I make two people out of one. What am I?

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?

You are given four results as below:
1111 = F
2222 = E
3333 = T
Then, can you find out how to code 4444?

I have feet, but no legs. Which animal Am I?

There is one thing that goes round the house and also inside the house but never even share a brief touch. What is it?

You need to arrange three 7 and mathematical symbols to form number 1?

Can you find a pattern and the missing number in the series given below?

100, 155, 258,? , 584, 819.

Why Aeroplane windows are round?

At a bar, three friends, Mr Green, Mr Red and Mr Blue, were having a drink. One man was wearing a red suit; one a green suit; and the other a blue suit. 'Have you noticed,' said the man in the blue suit, 'that although our suits have colours corresponding to our names, not one of us is wearing a suit that matches our own names?' Mr Red looked at the other two and said, 'You're absolutely correct. What colour suit is each man wearing?

No matter how little or how much you use me, you change me every month. What am I?