Alice the fox and Basilio the cat have grown
Cut a
There are six letters in the alphabet of the Bim-Bam tribe. A word is any sequence of six letters that has at least two identical letters. How many words are there in the language of the Bim-Bam tribe?
In how many ways can eight rooks be arranged on the chessboard in such a way that none of them can take any other. The color of the rooks does not matter, it’s everyone against everyone.
Find all the prime numbers
It is known that
Let
If
Definition: We call a number
Prove that
Let
Let