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Question

Which of these operations are commutative for integers?

A
Addition
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B
Subtraction
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C
Multiplication
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D
Division
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Solution

The correct options are
A Addition
C Multiplication
Addition and multiplication are commutative for integers.

If a and b are integers, then
a+b=b+a
Example : 1 + 2 = 2 + 1 = 3

a×b=b×a
Example : 1 × 2 = 2 × 1 = 2

On the other hand, subtraction and division are not commutative for integers.

If a and b are integers, then
abba
Example : (1 - 2) = -1 (2 - 1) = 1

a÷bb÷a
Example : (1 ÷ 2) = 12 (2 ÷ 1) = 2

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