Let an be the number of {A, B}-strings of length n with the property that every A is followed by an odd number of B's. a) Find a recurrence for the sequences bn =a2n and cn = a2n+1. b) Find a closed form expression for the generating function associated to an.

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A: Topic =  Derivative

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A: As per our guidelines we can answer only 1 question so kindly repost the remaining questions…

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A: Note: as per guidelines we support only three subparts of the questions.kindly repost next questions…

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