suppose the sequence a_n satisfies $lim_{n\rightarrow\infty}a_n\sum_{i=1}^n a_i^2=1$. What is the limit of  3n(a_n)^3?
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{"source": "LDJnr/Capybara#TheoremQA", "kind": "unknown", "evolved_from": null}
suppose the sequence a_n satisfies $lim_{n\rightarrow\infty}a_n\sum_{i=1}^n a_i^2=1$. What is the limit of  3n(a_n)^3?
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DUMMY RESPONSE
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