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

A certain street contains 100 buildings. They are numbered from 1 to 100. How many 9's are used in these numbers?

A family is trapped in a jungle. There is a bridge which can lead them to safety. But at one time, the bridge can only allow two people to pass through. Also, all of them are afraid of the dark and thus, they can't go alone.

Father takes 1 minute to cross, the mother takes 2 minutes, the son takes 4 and the daughter takes 5 minutes. While crossing the time taken will be according to the slower one. How can they all reach the other side in the minimum possible time?

There are nine letters in the below-given diagram. You have to form a nine-letter word using these letters.

What does an Island and the letter T have in common?

Find out which of the given views in the picture is accurately the top view of the given pyramid.

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

Complete the following series. It.s very logical:

1, 4, 5, 6, 7, 9, 11, __?

I speak without a mouth, and hear without ears. I have no-body, but I come alive with the wind. What am I?

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