State whether each of the following is a group. (a) All the real numbers with the rule

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State whether each of the following is a group.
(a) All the real numbers with the rule of combination for forming the product of two elements being addition.
(b) All positive integers with the rule of combination being multiplication.
(c) All real numbers except zero, with the rule of combination being multiplication.
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Quantum Chemistry

ISBN: 978-0321803450

7th edition

Authors: Ira N. Levine

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