A few days ago
which set is closed under addition?
a) Rational Numbers
B) Counting numbers.
Top 1 Answers
A few days ago
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I assume you mean natural numbers when you say counting numbers
the answer is both
closed means if you add any two numbers of a set then the result will be in the set also
Rational Numbers are closed under +, -, ÷, ×
natural numbers are closed under + & × but not under – & ÷ since 2 – 3 = -1 is not a natural number
and 2 ÷ 3 = 2/3 is not a natural number
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