Why is 6 afraid of 7?

The below given figure comprises of a pattern through which you can determine the missing letter. Can you push your mind to find the pattern and add the missing letter?

You are in a room that has three switches and a closed door. The switches control three light bulbs on the other side of the door. Once you open the door, you may never touch the switches again. How can you definitively tell which switch is connected to each of the light bulbs?

A blonde put eyeliner on her head. Why?

I look at you, you look at me I raise my right, you raise your left. What am I?

In which direction should the missing arrow point?

Can you count the number of squares in the given picture?

Can you fill the blank with the correct number?

6 30 870 756030 _____

If "P" means "-", "Q" means "/", "R" means "+", and "S" means "*" then find the value of the following:

21 Q 7 R 9 S 10 P 13

Which number should replace the question mark?