What has a ring but no finger?

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?

Can you solve below mathematical equation?

2^1234 - 2^1233

An office is divided into 8 cubicles. How many of the cubicles are painted if only 1/8 of the cubicles are painted?

I have one of the three numbers: 1, 2, or 3 in my mind. I speak only truth. You can ask me just one question for which I will only reply in yes or no or don't know. What question will you ask from me so that you are able to know the number?

Things are just as they seem, right? Well, check again.
Can you count the number of tigers in this picture ?

Count the number of triangles in the picture below:

What is the Surname of Barbie Doll?

If "P" means "-", "Q" means "/", "R" means "+", and "S" means "*" then find the value of the following:

21 Q 7 R 9 S 10 P 13

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