If n is a positive integer, then the expression n(n+3) + (n+3)(n+8) must be divisible by
This is a typical "cases" type but I omitted the usual choices like
(A) I only
Might be worth some discussion to consider more than the typical student's "plug-in" approach. That's why I added "EXPLAIN! "
There is some rich mathematics to be unearthed here IMO...
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