I know how to do a) and b) but unsure about c)
c) Number of strings that (do not not contain "cab" or "bac" BUT may contain repeated consecutive letters), OR (strings that do not contain repeated consecutive letters but may contain "cab" or "bac").
Only the solution of (c) is provided.
For any doubt comment below.
I know how to do a) and b) but unsure about c) c) Number of strings...
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