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If a1, a2……… are in AP then a1^-1, a2^-1……… are in __________

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If a1, a2……… are in AP then  a1^-1, a2^-1……… are in __________

(a) An airthmetic sequence

(b) A geometic progression

(c) Airthmetico-geometric progression

(d) None of the mentioned

I got this question in quiz.

I need to ask this question from Harmonic Sequences in chapter Basic Structures: Sets, Functions, Sequences, Sums and Matrices of Discrete Mathematics

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Right choice is (d) None of the mentioned

To elaborate: If a1, a2……… are in AP, then a1^-1, a2^-1………  are in Harmonic Progression.

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