Spot what is wrong here in below Picture?

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?

Count the squares in the matchstick puzzle below?

You need to arrange three 7 and mathematical symbols to form number 1?

How many words can a pen with half refill write?

Three friends decide to distribute the soda cans they had among them. When all of them had drunk four cans each, the total number of cans that remained was equal to the cans each one of them had after they had divided the cans.

Can you calculate the total number of cans before distribution?

You may enter, but you may not come in. I have space, but no room. I have keys, but open no lock. What am I?

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.

Christina has four daughters, and each of her daughters has a brother. How many children does Christina have?

During which month do people sleep the least?