There is a box in which distinct numbered balls have been kept. You have to pick two balls randomly from the lot.

If someone is offering you a 2 to 1 odds that the numbers will be relatively prime, for example
If the balls you picked had the numbers 6 and 13, you lose $1.
If the balls you picked had the numbers 5 and 25, you win $2.

Will you accept that bet?

Can you decipher the below rebus?

PBLUESAISNUERSES

I make a loud sound when I’m changing. When I do change, I get bigger but weigh less. What am I?

A father's child, a mother's child, yet no one's son.

Who am I?

Which is the correct shadow of the bird?

They do not possess flesh or feathers or scales or bone
But still, they are blessed with fingers and thumbs of their own.

What 5-letter word typed in all capital letters can be read the same upside down?

In order to complete the racing competition, the Mexico racetrack has to submit its top and the most famous three horses to win the competition. Due to an electrical storm, all the records are cleared and no one knows which horse holds the record. They all look identical and it becomes even more difficult to differentiate the horses. There are 25 horses in the Mexico racetrack. But there can be only five horses at a time on the track. What will the least number of races that can be conducted to find out the three fastest horses?

I am a five-letter word under you,
Remove the first letter and I am above you,
Remove the second as well and I am around you.

Who am I?

Spot 5 differences in two Christmas tree below: