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  • Brainly User
2014-10-29T18:44:30+05:30
This question is based on the formula (x-1)(x+1)=x²-1. Now starting from the last product, 2011*2013=(2012-1)(2012+1)=2012²-1. Now, √{1+2012²-1}=2012. Next product 2010*2012=2011²-1. Therefore, √{1+2011²-1}=2011. Going on like this you get the answer to be 2009
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ok thnx i got it
Happy to help
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