What number should come in place of the question mark below?

what's the probability of getting a king or a queen from a pack of 52 cards?

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?

Can you find the odd number in the following?

2716, 4135, 5321 and 7145

Three doctors said that Bill was their brother. Bill says he has no brothers. How many brothers does Bill actually have?

A maths symbol is hidden in the below Bar Graph. Can you decipher it?

In front of you, there are 9 coins. They all look absolutely identical, but one of the coins is fake. However, you know that the fake coin is lighter than the rest, and in front of you is a balance scale. What is the least number of weightings you can use to find the counterfeit coin?

I have Rs.50 and I spend it in the way as below.

One is to three as three is to five and five is to four and four is the magic number.
What is the pattern?

You are driving down the road in your car on a wild, stormy night, when you pass by a bus stop and you see three people waiting for the bus

An old lady looks as if she is about to die.
An old friend who once saved your life.
The perfect partner you have been dreaming about.
Knowing that there can only be one passenger in your car, whom would you choose?