If a, b, c are in GP, prove that a2, b2, c2 are in GP.
To prove: a2, b2, c2 are in GP
Given: a, b, c are in GP
Proof: As a, b, c are in GP
⇒ b2 = ac … (i)
Considering b2, c2
= common ratio = r
⇒ [From eqn. (i)]
⇒ = r
Considering a2, b2
= common ratio = r
⇒ [From eqn. (i)]
⇒ = r
We can see that in both the cases we have obtained a common ratio.
Hence a2, b2, c2 are in GP.