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b.) 3^7 . 7^3 . 2 / (42)^3 = 3^7 . 7^3 . 2 / (2.3.7)^3 = 3^7 . 7^3 . 2 / (2^3 . 3^3 .7^3)
=2^(1-3) . 3^(7-3) .7^(3-3) = 2^(-2) . 3^(4) .7^(0) = 1/2^2 . 3^(4) = 1/4 . 81 = 81/4