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Basel time!

Calculus Level 2

\[ \Large \sum_{n=1}^\infty \frac1{n^2} = \ ? \]

\[ \frac \pi e \] \[ \sqrt 2 \pi \] \[ \frac{ \pi^2}6 \] \[ \frac{ \pi^2}4 \]

Excel in math and science

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by Akash Einstein

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