Answer:
The denominator of the 7th term is
343
F(1) =1/1 = 1/1^3
F(2) =1/8 = 1/2^3
F(3) =1/27 = 1/3^3
...
F(n) =1/n^3
=> F(7) = 1/7^3 = 1/343
Hope this helps!
:)
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