Quantitative Aptitude Progression Harmonic Progression

Let the positive numbers a1, a2, a3, ...., a3n be in GP. If P is the GM of a1, a2, a3, ...., an and Q is the GM of an+1, an+2, an+3, ..., a3n, then what is the GM of 3n numbers?

1
P2Q
2
PQ2
3
\(\sqrt{PQ}\)
4
p1/3 Q2/3
5
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