Can you find the missing piece of the Porsche?

Solve this riddle by finding the odd one out from the rest.

There is a box full of marbles,
all but two are blue,
all but two are green,
and all but two are red.

How many marbles are in the box?

On a charity event in Russia, Murray beat Djokovic by winning six games and losing three games.
Note: There is a total of 5 service breaks(one who serve lost the game).
Who served first, Djokovic or Murray?

If there are fifteen crows on a fence and the farmer shoots a third of them, how many crows are left?

What is a word made up of 4 letters, yet is also made up of 3. Sometimes is written with 9 letters, and then with 4. Rarely consists of 6, and never is written with 5.

Solve the puzzle by telling what does below picture means.

Railroad Crossing, look out for the cars. Can you spell that, without any R's ?

What makes this number unique: 8,549,176,320?

What is the largest number you can write with just 3 digits?