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Topic: Number with n^3 , 109
Replies: 5   Last Post: Jan 10, 2013 5:42 AM

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mina_world

Posts: 2,142
Registered: 12/13/04
Number with n^3 , 109
Posted: Jan 1, 2013 10:52 AM
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Hello, teacher~

n^3 + (n+1)^3 + (n+2)^3 = 57 + 59 + 61 + ... + 109

Find the "n".

------------------------------------------------------------------------
Answer is 8.

http://board-2.blueweb.co.kr/user/math565/data/math/n3.jpg

This is a solution of elementary schoolchild(of course, clever)

Can you understand it ? I need your explanation.(used formula etc)



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