new to MSE :) I am confused with permutation problems involving identical objects.For example set = {GGGBP} how many 2-letter strings can be produced? Thanks in advance!
2026-04-06 13:04:12.1775480652
Permutations with identical objects 10
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There are $3$ different characters to select, so the number of length $2$ strings is $$3\cdot3-2=7$$ As this counts every combination of the $3$ letters ($3\cdot3$) except where the letters $B, P$ are selected twice ($-2$).