OCR FP3 2016 June — Question 4

Exam BoardOCR
ModuleFP3 (Further Pure Mathematics 3)
Year2016
SessionJune
TopicGroups
4 Let \(A\) be the set of non-zero integers.
  1. Show that \(A\) does not form a group under multiplication.
  2. State the largest subset of \(A\) which forms a group under multiplication. Show that this is a group.
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