Question: - 2, let k be an integer, + let Zik be the set of integers on which operation x is defined as afib =

- 2, let k be an integer, + let Zik be the set of integers on which operation x is defined as " afib = atbk where atb denotes sum in 72, Note that 710) is the group of integers under standard addition. For which values Jot K is z ( k) a group under the operation , ? Prove

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