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

An American nightclub called 'The Coconut Grove' had a terrible fire in which over 400 people died. A simple design flaw in the building led to a high death toll. Subsequently, regulations were changed to ensure that all public buildings throughout the country eliminated this one detail, which proved deadly. What was it?

Mr Red Lives in the red house.
Mr Green Lives in the greenhouse.
Mr Yellow Lives in the yellow house.

Who lives in the Whitehouse?

Find the missing number in the sequence below:

In this image, you can see three almost identical Doraemon images. Can you spot the odd one out from them?

There are forty elephants and they have forty-fore heads. How can this be possible?

Three people are in a room. Ronni looks at the Nile. The Nile looks at Senthil. Ronni is married but Senthil is not married. At any point, is a married person looking at an unmarried person? Yes, No or Cannot be determined.

As easy as you can get into me, it is as hard to get out of me.

Do you know what I am?

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

What does this rebus riddle means ?