I'm thinking about there are 4 cases:
- All C, No A or B.
- Exactly 1 A and 1 B.
- Exactly 2 A and 2 B.
- Exactly 3 A and 3 B.
However, I don't know to calculate the 2, 3, and 4 case.
2026-03-31 14:30:45.1774967445
A form has 7 questions, each with 3 possible answers: A , B , or C. How many ways that the answer sheet has the same number of A and B
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