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The library has 100 books, and those who borrow from the library need to sign the books.

Normal algorithm to find the number of books borrowed by at least one person:

A + B + C - (A B) - (B C) - (A C) + ( A, B, C)

Now, A, B, C, A, B, B, C, A and C are all known.

The number of books borrowed by at least one person is:

33+44+55-29-36-25+ (A, B, C)

=42+ (A, B, C)

A, B 29

A and C 25

B and C 36

Then the maximum number of books borrowed by A, B and C is 25

So the maximum number of books borrowed by at least one person is:< /p>

42+25=67 books

Then the books that have not been borrowed are at least:

100-67=33 books