If a1, a2, a3 are in airthemetic as well as geometric progression then which of the following is/are correct?
(a) 2a2 = a1 + a3
(b) a2 = (a1a3)^1/2
(c) a2 – a1 = a3 -a2
(d) All of the mentioned are correct
I got this question in an online interview.
Question is taken from Arithmetic and Geometric Mean topic in chapter Basic Structures: Sets, Functions, Sequences, Sums and Matrices of Discrete Mathematics