Consider the formula
n(A ⋃ B) = n (A) + nB) − n(A ∩ B)
a) Show that this relation holds for A = {a, b, c, d}and B = {b, d, e, f, g, h}.
b) Make up your own sets A and B, the consisting of at least six elements. Using these sets, show that the relation holds.
c) Use a Venn diagram and explain why the relation holds for any two sets A and B.
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