SOLUTION: determine whether each set of numbers is closed under the indicated operation. 1) irrational, addition

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Question 502963: determine whether each set of numbers is closed under the indicated operation.
1) irrational, addition
Answer by richard1234(7193) About Me  (Show Source):
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1. It is not closed, because the sum of two irrational numbers could be rational (e.g. pi + (-pi)= 0).