I see you're thinking too much. Instead of checking the answer by specific example, you're trying to find general solution.
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Originally Posted by anushrimali
hi lime, theres so mention of it being a group with addition operation.
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Despite it doesn't say anything about addition, I brought up Z15 just as the example of group that satisfied given condition.
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Also...The order of the group = number of elements in the group
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Does the same defn hold for order of a subgroup?
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Yes.