John R. answered 03/28/19
Calculus, Probability, and Stat Tutor, Math Degree, 20+ years Exp.
I imagine one could build a bridge connecting them. I don't like to be dogmatic about what concepts might be related. I will say this, though, I have used the inclusion-exclusion principle extensively in probability, but I never thought of it while working on the Maclaurin Series for any analytic function.
Of course, the alternating signs are a sort of adding and taking away of sorts, which could be thought of as an abstraction of the principle to the way I think of it for probability. I may find myself pondering the issue. As an initial thought, though, wouldn't then all addition and subtraction operations fall under that umbrella?
As to Taylor Series, Khan Academy's series on Taylor Series really helped me think of them in a much more intuitive way.