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![[Post New]](/templates/default/images/icon_minipost_new.gif) 11 Jan 2008 10:20:18 IST
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The product of roots taken 2 at a time in the above answer is wrong.
the correct way is ( 1.2 + 1.3 + 1.4 .... + 2.3 + 2.4 + 2.5 +.......99.100)
To find this ,
consider ( 1+ 2+ 3+ ..... 100)( 1+ 2+ 3+ ..... 100) = 5050*5050=25502500
here the squares of the nos. have been added as extra and all the other terms have repeated exactly twice.
so subtract the sum of squares and divide by 2.
answer = [ 25502500 - ( 100) ( 101) ( 201) / 6 ]/2= 12582075
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this reply: 5 points
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Moderation Team
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