 Solution

ID: past-exam-of-the-mathematics-course-of-the-year-1-of-the-natural-sciences-course-of-the-university-of-cambridge/2023/paper-2/14/b/i/solution

The second bin is forced to contain

A, B

, leaving the other four letters in the first bin. Since order within a bin is irrelevant, this gives exactly

1

set partition of the specified bin sizes.

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