a)
|A^n| = |A|^n = 3^2 = 9
|B^n| = |B|^n = 2^3 = 8
b)
|A^0 ∪ ... ∪ A^n| = |A|^0 + ... |A|^n = ∑ (k = 0 bis n) (|A|^k, k) = (|A|^{n + 1} - 1)/(|A| - 1) = (3^{2 + 1} - 1)/(3 - 1) = 13
c)
|(A ∪ B)^{m + n}| = |A ∪ B|^{m + n} = 5^5 = 3125
d)
|A^n ο B^n| = |A|^n * |B|^n = 3^2 * 2^3 = 9 + 8 = 17