How can you take 2 from 5 and leave 4?

Can you calculate the probability of getting a sum of six when a dice is thrown twice?

John and his wife were living in a rural place. On a particular day, John's wife fell ill and he called the local doctor. When the doctor picked up, he said, "Doctor, my wife is ill. She might have appendicitis."

"This can't be possible! I took out her appendix two years ago myself," the doctor explained.

When diagnosed, John's wife was found to have appendicitis. How can this be possible?

You walk into a room where there are three primates held in their respective cages:
1) A lion who is eating the flesh of a goat.
2) An orangutan who is playing with blocks.
3) A donkey who is sitting idle.

Who is the most intelligent primate in the room?

Can you replace the question mark with the correct number?

Find the missing number in the sequence below:

Spelt forwards I’m what you do every day, spelled backwards I’m something you hate. What am I?

You have to fill the below given grid in a manner that every row and column contains the digits 1 to 6. Also, make sure that the squares that are connected with each other must contains the same digit.

I am lying and I always lie. Tell me whether I am lying or telling the truth.

Get total of 120 by using five zeros 0,0,0,0,0 and any one mathematical operator.
Do you ?