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  1. If a + b = 3, then the value of a³ + b³ + 9ab is :
    1. 27
    2. 9
    3. 16
    4. 81
Correct Option: A

It is given, a + b = 3
∴ a³ + b³ + 9ab
= a³ + b³ + 3ab × 3
= a³ + b³ + 3ab (a + b)
= (a + b)³ = (3)³ = 27


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