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i need a and f please. show all work. thank you.

3.1. Find the infimum and supremum of each of the following sets. a) $E={x?R:x_{2}+3x=10}$ b) $E={x?R:x_{2}+3x?10>x_{2}$ and $x<10}$ c) $E={p/q?Q:2p_{2}?4q_{2}>0$ and $0<p<2q}$ d) $E={x?R:x=(?1)_{n}/n$ for $n?N}$ e) $E={x?R:x=1/n+(?1)_{n}/n$ for $n?N}$ f) $E={n?N:5?(?4)_{n}/2_{2n}}$

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