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Question

Identify the pair consisting of unlike terms from the following options.

A
6xyz and 7yzx
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B
13xy and 7yx
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C
3y and 9z
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D
6x2 and x22
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Solution

The correct option is C 3y and 9z
Unlike terms are terms which contain the different variables or same variables but raised to different power.

In 6xyz and 7yzx, both the terms contain the same variables xyz, raised to the same power. Hence they are like terms.

In 13xy and 7yx, both the terms contain the same variables xy, raised to the same power. Hence they are like terms.

In 3y and 9z, the terms contain different variables, that is x and z. Hence they are unlike terms.

In 6x2 and x22, both the terms contain the same variable x2, raised to the same power. Hence they are like terms.

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