If a + b = 3,then find the value of a³ + b³– 3ab
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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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