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  "body": "\n## Problem\n\n- [[Euler's Basel sum|0DMY75D6FV]], $\\qquad \\sum_{n=1}^\\infty \\frac{1}{n^2} = \\frac{\\pi^2}{6},$ can be demonstrated by considering the expected exit time of planar Brownian motion from an infinite strip. A number of other less well-known identities can be deduced in a similar manner.\n",
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