{ "cells": [ { "cell_type": "markdown", "metadata": {}, "source": [ "
\n", "OK, so here's what you're supposed to do: take the matrix $A_{2020}$ (that's size $2020\\times 2020$, so it's pretty large..) and tell me what the entry is in the last row and last column of its inverse $(A_{2020})^{-1}$.\n", "
\n", "