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b) P u Q = {t, e, p, i, b, u, n, g, a, l, o}
c) P - Q = { }
d) Q - P = {t, p, b, n, g, l}
3 a) A - B = {a, b, d, e}
b) B - A = {g, h, i, j}
c) A n B = {c, f}
d) A u B = {a, b, c, d, e, f, g, h, i, j}