The expressions 1 + (2 + 3) and (1 + 2) ...

The expressions 1 + (2 + 3) and (1 + 2) + 3 are equal by the_________________.

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NCERT EXEMPLAR-INTEGERS-VOCOBULARY

is the of addition.
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The expression 3x× 4 and 4 x× 3 are equal by the
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The expressions 1 + (2 + 3) and (1 + 2) + 3 are equal by the.
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Multiplication and are opposite operations.
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and are commutative.
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