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In this paper, a mathematical formula method for encrypting and decrypting the answer sheet number is given.
There is a very simple method.

That is, for example, the number is 18, and after encryption, it is 118 (meaning a1and an 8).

Another example is 332, which is 23 12 after encryption (that is, two 3 s and one 2).

Recovery is also very simple.

For example, 24 13 is the reduced number 443.