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Let the numbers a1,a2,a3...an constitute...

Let the numbers `a_1,a_2,a_3...a_n` constitute a geometric progression. If `S=a_1+a_2+....+a_n, T=1/a_1+1/a_2+....+1/a_n and P=a_1a_2a_3....a_n` then `P^2` is equal to -

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