Circle True (T) or False (F). F (a) a*b = a - b is a commutative...

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Circle True (T) or False (F). F (a) a*b = a - b is a commutative binary operation on Z. (b) a * b = a - b is an associative binary operation on Z. F T T T F T F TF {(82): : a R* is closed under matrix multiplication. R}i 2a (c) The set (e) < Z,+> is a cyclic group. (){ (a): R} has no identity under matrix multiplication. : a R* Circle True (T) or False (F). F (a) a*b = a - b is a commutative binary operation on Z. (b) a * b = a - b is an associative binary operation on Z. F T T T F T F TF {(82): : a R* is closed under matrix multiplication. R}i 2a (c) The set (e) < Z,+> is a cyclic group. (){ (a): R} has no identity under matrix multiplication. : a R*