If x and y are natural numbers such that...

If x and y are natural numbers such that x+ y = 2017, then what is the value of `(-1)^x + (- 1)^y` ?
यदि x तथा y प्राकृतिक संख्याएँ इस प्रकार है कि x+y = 2017 है, तो `(-1)^x + (- 1)^y` का मान क्या है?

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