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If x and y are natural numbers such that x + y = 2017, then what is the value of (-1)x + (-1)y?
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Sum of two numbers can be odd only if one of them is odd and other one is even. Let x be odd and y be even ⇒ (-1)x + (-1)y = -1 + 1 = 0 ∴ The value is 0
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