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puspendu loves solving puzzles at PuzzleFry.com. I am proud PuzzleFry member and like my time invested in solving brain teasers.
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n(n+1)/2=276
n2+n-552=0
n2+24n-23n-552=0
(n+24)(n-23)=0n=23
the date is 23rdThis answer accepted by SherlockHolmes. on 26th November 2015 Earned 20 points.
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