What is the algorithm and the essence of the work of a real-life script of 100% prediction of a result made by a person?

Question

JavaScript

Good time everyone.
Perhaps a button accordion, but nonetheless. There is a winrar script that guesses the result of arithmetic operations from any conceived number with 100% accuracy. It is located here .
The bottom line is that by performing arithmetic operations, you come to a result that will match both you and the program. This completes her work. How this can be implemented, I was not able to understand either seven years ago or now)
Judging by the code, it is obvious that everything is built on pseudo-random numbers, but even so, it remains a mystery to me how exactly the result is "guessed". I am not a mathematician, so it is likely that I missed a lot.
Perhaps you can do it.

Answer 1

I advise you to read "mathematical tricks" by Yakov Isidorovich. Discover a lot of new "magic".

Answer 2

A trick to impress a girl when meeting:
1) You say that you are psychic and can read minds.
2) You ask her to guess a number from 1 to 100.
3) Then your acting skills come into play, you can learn about how psychics behave from many films or programs.
4) Call a random number.
5) Profit!!!
PS will work, of course, with one out of a hundred, but what effect

Answer 3

Is this math?
x + 1 + 2 + 3 + 5 = x + 11
x + 11 = x + 7 + 4
x - 7 - x = 4 (Subtract one number, then subtract what you guessed ... The answer is four!)

Answer 4

Think of a number X from 103 to 997, in which the first and last digits differ by more than 1. Write it in reverse order (you get Y), and subtract the smaller from the larger of the X,Y numbers. You get Z. Now find the sum of the number Z, written in reverse order, and Z itself. You get 1089. This is magic of the next order.

Answer 5

there is a video on the topic

Answer 6

If there was a possibility of "100% prediction of the result" - then the world would have been different for a long time ....
alas, this does not exist.
But mathematical riddles-jokes, quite.