Question

Let the sequence be 1×2, 3×2^2, 5×2^3, 7×2^4, 9×2^5……… then this sequence is _________

(a) An arithmetic sequence

(b) A geometic progression

(c) Arithmetico-geometric progression

(d) None of the mentioned

I have been asked this question in an interview for job.

My enquiry is from Special Sequences in division Basic Structures: Sets, Functions, Sequences, Sums and Matrices of Discrete Mathematics

Answer 1

Correct answer is (c) Arithmetico-geometric progression

To explain: If a1, a2……… are in AP and b1, b2………. are in GP then a2b2, a2b2,……… are in AGP.