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G5=243
Explanation:
Gn=r⁵¯¹G1
given a1/g1=3 & r=3 then substitute in the formula at the above then we will get
G5=3⁵¯¹ (3)
G5 =3⁴(3)
G5=81(3)
G5=243

The harmonic frequency refers to the resonant frequency that is an integral multiple of the fundamental frequency, harmonics are usually simple sinusoidal oscillation at a single frequency. where as Resonance frequency are frequencies that are not necessarily sinosudal or integral multiple of fundamental frequency and it may have complex oscillations made up of multiple harmonics ~
It's like if you play a piano with a single key, it will show harmonic frequency, but if you use multiple keys at a time it may show Resonance.
I am willing to help you out however the question is incomplete