\( \definecolor{colordef}{RGB}{249,49,84} \definecolor{colorprop}{RGB}{18,102,241} \)
Let \(n\) be an integer. We set \(a = 7n + 3\) and \(b = 2n + 1\).
Show that \(a\) and \(b\) are coprime.
Capture an image of your work. AI teacher feedback takes approximately 10 seconds.