Exercise 1: Set Operations on A = {2,4,6,8,10} and B = {4,8,12,16} — Possible Solution
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A UNION B (everything in A, B, or both)
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Combine every element from both sets, listing each value only once
even if it appears in both:

  A u B = {2, 4, 6, 8, 10, 12, 16}

A INTERSECT B (only what's in both)
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Check each element of A against B: 2 (not in B), 4 (in B - keep), 6
(not in B), 8 (in B - keep), 10 (not in B).

  A n B = {4, 8}

A MINUS B (in A, but not in B)
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Take every element of A, and remove any that also appear in B: 2
(stays, not in B), 4 (removed, in B), 6 (stays), 8 (removed, in B), 10
(stays).

  A - B = {2, 6, 10}

B MINUS A (in B, but not in A)
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Take every element of B, and remove any that also appear in A: 4
(removed, in A), 8 (removed, in A), 12 (stays, not in A), 16 (stays,
not in A).

  B - A = {12, 16}

WHY A - B AND B - A ARE DIFFERENT SETS
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Per this chapter, "difference isn't symmetric, unlike union and
intersection." A - B keeps only A's own unique elements (2, 6, 10),
while B - A keeps only B's own unique elements (12, 16) - genuinely
different results, since "what's only in A" and "what's only in B"
are two separate questions about the same pair of sets.

WHY THIS WORKS AS AN ANSWER
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Each operation is worked through element by element rather than
stated as a bare final answer, and the result for A - B is explicitly
contrasted with B - A to confirm they aren't the same set, matching
this chapter's own explicit warning that set difference is not
symmetric.