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

A man calls his dog from the opposite side of a river. The dog crosses the river without a bridge or a boat and manages to not get wet. How is this possible?

What type of tree can I carry in my hand?

Count the number of triangles in the picture below:

When it's bad luck to meet a black cat?

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?

I start and end with 500 and carry a 5 in my heart. But I require the first letter and the first number to be complete. I am the name of a King.

Who am I ?

I am beautiful, up in the sky. I am magical, yet I cannot fly. To people I bring luck, and to some people, riches. The boy at my end does whatever he wishes. What am I?

It is a nine-letter word.
The exact opposite of the phrase "friendly and outgoing"
It contains the word "over".
It starts will a vowel.

What is it?

Can you count the number of quadrilaterals in the picture below?