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The terms x, x+2, x+4, . . . , x+2n form an arithmetic sequence, with x an integer. If each term of the sequence is cubed, the sum of the cubes is -1224. What is the value of n if n > 3?

 Feb 28, 2021
 #1
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Not sure how to solve this but  

-9+ -73  +  -53  + -33  = -1224

 Feb 28, 2021

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