What does it mean?

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

Can you fill the blank with the correct number?

6 30 870 756030 _____

You have two buckets - one holds exactly 5 gallons and the other 3 gallons. How can you measure 4 gallons of water into the 5 gallon bucket?

(Assume you have an unlimited supply of water and that there are no measurement markings of any kind on the buckets.)

How can you take 2 from 5 and leave 4?

A bag contains 64 balls of eight different colours. There are eight of each colour (including red). What is the least number you would have to pick, without looking, to be sure of selecting 3 red balls?

That attorney is my brother, testified the accountant.

But the attorney testified he didn't have a brother.

Who is lying?

Can you solve the tricky chess rebus puzzle below by ciphering the hidden meaning?

Make eight squares by moving only two matchsticks.
Note- Square can be of different sizes.

A Car driver was heading down a street in Washington. He went right past a stop sign without stopping, he turned left where there was a 'no left turn' sign and he went the wrong way on a one-way street. Then he went on the right side of the road past a cop car. Still, he didn't break any traffic laws. Why not?