Explain how BBB is a repeated subsequence?

#1

Question link :

If we consider the three B’s as B1,B2,B3
and the question says that AB1B2B3 is repeated subsequence with BB as the repeated subsequence, then B1B2 and B2B3 share common index of 2 in the string and B1B3 and B2B3 share a common index of 3 in the string , if they are sharing the same index in the string in one case 2 and in the other case 3 then how is it a repeated subsequence?

BBABB can be considered a repeated subsequence according to me

Please explain how ABBB is a repeated subsequence?

#2

@deepaknike032
ABBB is a repeated sequence, because B1, B2 and B2,B3
AAB is not repeated sequence, because A1B1 and A2B1 --> B1 occurs at the same place in both the sequence which is not allowed.

#3

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