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# HELP ASAP

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For each positive integer $n$, the set of integers $\{0,1,\ldots,n-1\}$ is known as the $\textit{residue system modulo}$ $n$. Within the residue system modulo $2^4$, let $A$ be the sum of all invertible integers modulo $2^4$ and let $B$ be the sum all of non-invertible integers modulo $2^4$. What is $A-B$?

May 26, 2020