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

What is the fewest number of coins that would be required in order to make sure each and every coin touches exactly three other coins?

Below, you will find the mathematical proof that 10 equals 9.99999?. But is that possible or there is something wrong about it? Can you find the error?

x = 9.999999...
10x = 99.999999...
10x - x = 90
9x = 90
x = 10

When I go in I might cause pain. I cause you to spit and ask you not to swallow. I can fill your hole. What am I?

At a Society election for president, precisely 963 votes were cast.
There is a total of 4 candidates that participate in the election.

The winning candidate exceeds the opponents by 53, 79 and 105 votes.

How many votes do each candidate gets?

I sleep during the day and fly at night, but I have no feathers to aid my flight. What am I?

Three people are in a room. Ronni looks at the Nile. The Nile looks at Senthil. Ronni is married but Senthil is not married. At any point, is a married person looking at an unmarried person? Yes, No or Cannot be determined.

You can see three almost identical images below. Can you spot the odd one out from them?

If in a car race, the man who came two places in front of the last man finished one ahead of the man who came fifth, how many contestants were there?

I look at you, you look at me, I raise my right, you raise your left. What am I?