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Question

If (a+b=3), then what is the value of (a3+b3+9ab)?

A
18
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B
27
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C
81
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D
Cannot be determined due to insufficient data
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Solution

The correct option is B 27
(a+b)3=a3+b3+3ab(a+b)
a3+b3+3ab×3=33=27

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