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B
15 - 4yz
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C
-60xyz
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D
-60y
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Solution
The correct option is D
-60y
On multiplying x with x, its power is raised to 2 i.e., x×x=x2 On multiplying z with z its power is also raised to 2 . i.e., z×z=z2 Multiply all the coefficients to get 5×(−4)×3=−60