Question

Tim U cua 78

Answer 1

Ư(78)={1,2,3,6,13,26,39,78}

Answer 2

Ư(78)={1,2,3,6,13,26,78}

Answer 3

Ư(78){1;2;3;6;13;26;39;78}

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Answer 4

U(78)={1;2;3;6;13;26;39;78}