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Hello I want to know if someone could correct this exercice ? Hello I want to know if someone could correct this exercise please ?

Hello I want to know if someone could correct this exercice ?
Hello I want to know if someone could correct this exercise please ? 1 ) Show that the square of an integer not multiple of 5 has the forme : 5n+ 1 OR 5n-1. 2) Show that the cube of an integer not multiple of 7 has the forme; Inth ; 7n - 1

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