In a school of 120 students, 70 study Biology, 50 study Chemistry, and 20 study both. How many students study neither Biology nor Chemistry?

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A cylinder has height $h = 10 cm$ and base radius $r = 6 cm$ . A cone of identical base and height is carved out from inside th…
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A circle is centered at $(3, - 2)$ and passes through $(7, 1)$ . What is the equation of this circle?
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