13 decks of cards have been mixed. What is the minimum number of cards that must be taken out from the above-mixed cards to guarantee at least one 'four of a kind?

When does a USA Potato change its nationality?

You knock a Table over in the library, and suddenly 20 eyes are looking at you.

Take away my first letter, then take away my second letter. Then take away the rest of my letters, yet I remain the same. What am I?

What number comes next in this sequence:
7 8 5 5 3 4 4 _

Can you find out the remainder when 3^300 is divided by 5?

Which alphabet letter is a question?

I am a word of 12 alphabets.

* Alphabets 12, 4, 7, 2, 5 : Eastern beast of burden
* Alphabets 1, 8, 10, 9 are street made famous by Sinclair Lewis.
* Alphabets 11, 3, 6 are past.

On whole it means a person suffering from delusions of greatness.

What Is it ?

This is a classy optical illusion puzzle. What more you can find except bricks in the image below?

You order chicken wings at KFC in the boxes of 6, 9 and 20. What is the largest number of wings that you cannot obtain by buying in any combination of the boxes?