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20. Divide 6237, by 143 21. Find x in the following congruence statements: a) 42 x (mod 6) b) 42 = x (mod 9) e) 42 = x (mod 2

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k= 1, 2, 3, ... (2) (as 42 x (modb) - 42-x 36k > x=0, so, 4 2 =0 (mod 4) (6) 42 = x (mod g) = 42 - x = 9K x=6, so 42 = 6 (mod= = . ( رووم 21 - اعة. (ط) ( 660

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