If eleven plus two equals one, what does nine plus five equal?

My cousin lives in one story house in Antarctica. His house is made the of-of sandstone. what is the color of stairs?

Find three numbers such that

* When we multiply three numbers, we will get the prime numbers.
* The difference between the second and the first number is equal to the third and second.

When I asked a girl's name she told me her name is the date '07/09/2001'.

I thought for a few seconds and then I got her name. Do you?

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.

Which digit occurred maximum times between the number 1 and 1000?

Next Number in the Series,

5, 16, 49, 104, ?

Which number should replace the question mark?

Can you find out what is missing?

1 3 5
2 4 ?

Hint: It's not six. Think out of the box.

If you toss a coin 10 times and it lands heads up every time, what are the chances it will land heads up if you toss it again?