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Question
For the pair of rational numbers, given below, verify that the multiplication is commutative.
`(-1)/5 "and" 2/9`
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Solution
`= (-1)/5 xx 2/9 = ((-1)xx2)/(5xx9) = (-2)/45`
And, `2/9 xx ((-1)/5) = (2xx(-1))/(9xx5) = (-2)/45`
`therefore (-1)/5 xx 2/9 = 2/9 xx (-1)/5`
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