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2500, 100n2
Restate the question: what are the 5th and nth term of (10n)2?
If this is not your question, please clarify and resubmit the question.
Assuming the first term is when n=1, then the 5th term is (10x5)2 = (50)2 =2500.
The nth term would be just (10n)2, although you could expand and simplify to get (102)(n2) = 100n2.
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