I read the solutions to problem one of the Difficult Math Doc, and do not believe they are correct. The solution says 79, but if you plug in this number, and calculate the sum, you do not get 6320, which is the product of 79 and 80. I used a different formula, and I believe the real answer is n = 159. You can do the calculation to verify that. Any thoughts?
wlvoh
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Question about problem one
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Good discussion about this here: https://www.beatthegmat.com/viewtopic.php?t=406wlvoh wrote:I read the solutions to problem one of the Difficult Math Doc, and do not believe they are correct. The solution says 79, but if you plug in this number, and calculate the sum, you do not get 6320, which is the product of 79 and 80. I used a different formula, and I believe the real answer is n = 159. You can do the calculation to verify that. Any thoughts?
wlvoh
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