If there are fifteen crows on a fence and the farmer shoots a third of them, how many crows are left?

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

Nine marbles are arranged in the image below. Can you slide two marbles to form a square?

A dead body is found outside a multi-story multinational company. The case is reported and a homicide detective is called on the crime scene.

He looks at the body and then towards the building. From the position of the body, it is evident that the victim committed suicide. He goes to the first floor of the building and then walks in the direction of the dead body, opens the window and toss a coin in the air.

He goes to second floor and again repeats the process. He keeps doing this till he is done on all the floors. Then he returns back to the floor and tells his team that it is a murder.

How in heaven did he deduce that?

The following four words might seem abrupt to you. But you can make them meaningful by just adding vowels.
RDSH
GGPLNT
TMT
NN

Hint: All of them are vegetables.

Can you count the number of squares in the given picture?

Count the Triangle in the figure given below:

A prisoner is told: "If you tell a lie, we will hang you and if you tell the truth, we will shoot you." What did the prisoner say to save himself?

How many triangles are there in the picture below?

How can you write nineteen in a manner that if we take out one, it becomes twenty?