Algebra and Trigonometry (6th Edition)
6th Edition
ISBN: 9780134463216
Author: Robert F. Blitzer
Publisher: PEARSON
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Question
Which of the following sets is not closed for the operation °, which is defined by the rule a°b = a + b arbitrary integers a,b from this set?
(a) The set of all odd integers
(b) The set of all even integers
(c) The set of all positive integers.
(d) The set of all negative integers.
(e) None of the above
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