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

How many words can a quill made with the feather of a pigeon write with a 100ml bottle of black ink?

One day, I thought of ways that can be used for creating a palindrome. So I decided that I will turn into a larger number by adding the reversed digits to the original number and keep doing it till I finally obtained a palindrome.

I am not sure if this process will always result in a palindrome eventually but I was able to produce a four-digit palindrome. Can you guess my starting number?

John and Jill are madly in love with each other. To remind Jill of his pure love, John wants to send her a ring by post but in their country where burglary is quite prominent, any package that is not locked comes under the risk of being stolen for the contents.

John and Jill possess many padlocks but neither one of them has the other key.

Can you find a way John can send the ring to Jill safely?

If Bihan is 10, Anirudha is 20, and Kim and Seal are both 5, but Rikold is 10, how much is Kenniger by the same trend?

Can you make four (4) nines (9) equal 100?

You see a mathematical expression in the picture. Can you think of a movie that this expression refers to?

The person who makes it has no need for it. He who purchases it does not use it. The person who does use it does not know they are. What is it?

What question can you never answer yes to?

In the given figure, move three matchsticks so that the resulting figure contains two rectangles.