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BANDARU THANUSH

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letx=20142014 then 20142015=x+1 then 20152014=x+10000 then 20152015=x+10001 20142015×20152014-20142014×20152015 =(x+1)(x+10000)-x(x+10001) = x²+10001x+10000-x²-10001x = 10000

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