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If a3 + b3 = 217 and a + b = 7, then the value of ab is:1. -12. 63. -64. 7 |
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Answer» Correct Answer - Option 2 : 6 Given: a3 + b3 = 217 (a + b) = 7 Formula Used: (a + b)3 = a3 + b3 + 3ab (a + b) Calculation: Substituting the values in the formula (7)3 = 217 + 3ab (7) 343 – 217 = 21ab 126/21 = ab ∴The value of ab is = 6 |
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