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If x + y = 7 and xy = 10, then the value of (1/x3 + 1/y3) is:
1/x³ + 1/y³ = y³ +x³/ x³y³
(x+y)³ - 3xy(x+y) / x³y³
(7)³ - 3x10x7 / (10)³
343 -210 / 1000
Hence option 4 is the correct answer.
By: Himani Bihagra ProfileResourcesReport error
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