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

Can you solve below mathematical equation?

2^1234 - 2^1233

There was a minor accident with a doctor's son but the doctor noticed no major injury. After the treatment, the father of that doctors son is sitting with the son of the doctor without the doctor being in the room.

How can this be possible?

What does the below mathematical rebus mean?

What will you call your mother's brother's brother-in-law?

How can you leave a room with two legs and return with six legs?

Your mother’s brother’s only brother-in-law is asleep on your couch. Who is asleep on your couch?

In a box, there is a jumble of 7 red balls, 6 blue balls, 5 green balls, and 4 yellow balls. What is the minimum number of balls, will you have to pick up so that you have at least 4 balls of the same colour?

In a fruit store, there was a unique weighing machine that was made to weigh only cherries and strawberries as they were priced the same.

Other fruits like watermelons or mango had different machines as they were expensive.

A man successfully buys watermelons at the price of cherries. How?

What always comes into a house through the keyhole?