Fix mathematical error in Chapter 1, Problem 57 solution#140
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…mbinatorial part for Principle of Inclusion-Exclusion
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Description
This PR corrects an error in the solution for Chapter 1, Mixed Practice, Problem 57.
The Issue:
The original solution incorrectly calculated the probability by not including the combinatorial part in the summation. Thus, the solution also ended up incorrect.
The Fix:
I have updated the solution to reflect the correct mathematical approach, where:
Formatting:
I have ensured the new '.tex' file follows the repository's guidelines for naming structure.
Let me know if you need any changes to the formatting or explanation!