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

Two friends were betting. One said to the other, "The coin will be flipped twenty times and each time the coin lands on the head, I will give you $2 and each time it lands on the tale, you will give me $3." After flipping the coin twenty times not a single penny was exchanged among them.

How many times did the coin land on heads?

There are five people. One of them shot and killed one of the other five.
We know following clues:
1. Dan ran in the NY City Marathon yesterday with one of the innocent men.
2. Mike consider being a farmer before he moved to the city.
3. Jeff is a top notch computer consultant and wants to install Ben new computer next week.
4. The murderer had his leg amputated last month.
5. Ben met Jack for the first time six months ago.
6. Jack has been in seclusion since the crime.
7. Dan used to drink heavily.
8. Ben and Jeff built their last computers together.
9. The murderer is Jack's brother. They grew up together in Seattle.

Consider yourself to be a famous detective "Sherlock Homles", Can you find the killer?

Find The Next Number in this series.
1, 2, 6, 42, 1806 ?

Find the missing letter in the last circle logically in the given below picture.

If I remove one from eleven it becomes Ten and if I remove one from nine also becomes Ten. How?

How many times can you subtract the number 5 from 25?

What does the below image rebus riddle means ?

why number 8549176320 is one of a kind?

Where do you go to learn how to make ice cream?