For example I want to know number of ways I can select $2$ items from $AAABBC$ i,e $3$ of one group,$2$ of other and $1$ of last.
2026-04-11 14:01:30.1775916090
Number of ways of selection from a mixed group
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AA, AB, AC, BB, BC
There are 5 options if you want this.
I think there is not general formula for it.