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a. 120 =2 x 3 x 5, 90 =2 x 32 x 5 therefore G.C.D. =2 X 3 X 5
b. 72, 128 72 = 2^3 x 3^3, 128 = 2^7 therefore G.C.D. = 2^3
joseph rimiru answered the question on October 12, 2017 at 19:32
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