THETA DIVISION

Question 60

Number Theory★Question Bank

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Question

How many of these four sets below are CLOSED under the given operation?

\begin{array}{ll} \{\text{Odd Integers}\}\text{ Addition} & \{\text{Integers}\}\text{ Multiplication}\\ \{\text{Rational Numbers}\}\text{ Division} & \{\text{Natural Numbers}\}\text{ Subtraction} \end{array}

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