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b) (1/3)^3 * (2/3)^3 = (1/3 * 2/3 )^3 = (2/9)^3 = 8/729
c) (-5)^4 * (-1/5)^4 = (-5*(-1/5))^4 = 1^4=1
d) x^2 * y^2 * z^2 = (xyz)^2
e) a^n * b^n * c^n = (abc)^n