- Hello, I need help on probability?

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How many terms must you add to approximate the series to 4 decimal places? Series: Σ 1/n^2 [1,infinitey)? Half of them are fantasy, 1/4 of them are biographies, 1/8 of them are mysteries, and 6 of them are sports books. How many books total? Will the fact that we're running out of Helium harm us in any way? Why is the pH of sweat 4.6?
Needing to know for an anatomy class, thanks !? How do volcanoes effect people?