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What is the value of xy

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Source: — Data Sufficiency |
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by linkinpark » Wed Dec 30, 2009 10:22 pm
pretty simple
stmt 1 and 2 both give 2 equations with 2 variable but no value is given for either x or y

combining you get
x^2 + 2xy + y^2 = 37 (stm1)
x^2 - 2xy +y^2 = 17

we can subtract both to get value of xy hence C
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