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2014-07-24T03:55:05+02:00
84 = 1 x 57 + 27
57 = 2 x 27 + 3
27 = 3 x 9 + 0 

pgcd (57 ; 84) = 3

120 = 2 x 48 + 24
48 = 2 x 24 + 0

pgcd (120 ; 48) = 24