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Recent questions tagged subsequence

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No of subsequence
I understand that number of subsequences for a string of length n is 2^n when we don’t have any repetition. What is the number of “unique” subsequence when we have repetitions. As in the string : aabbbccddd
I understand that number of subsequences for a string of length n is 2^n when we don’t have any repetition.What is the number of “unique” subsequence when we have r...
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