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Hello! It seems you want to check your solution for one of our puzzles. We review all the solutions on the website by hand and will gladly review yours!

But first, it is important for us to make sure that you are not a robot :)

Please take a test from Megamind by solving 3 problems — these problems are easier those that are published on the website. All answers are numerical.

30 people are working in a department. One has to chose a boss and a boss assistant. How many ways to do it?

Name the following member of the sequence: 0 1 3 6 10 15 21 ...

How many natural numbers less than 1000 are there that are not divisible neither by 5, nor by 7?

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You need to solve 3 puzzles from 3, and then to chose login, password, provide e-mail