Trial Q (1 Viewer)

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errrr since it's given that Sn = 0 if n is a multiple of 3, gp isn't needed. instead u can do w+w^2+...+w^3k + w^(3k+1) = 0 + w^(3k+1) = w and then do the same thing when sum is to 3k+2
 

Luukas.2

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cheers boss but I mean both work lol
True, but it took me a while to figure out why your working was valid... it looks like you multiplied by but in fact you didn't... I thought others might have not been sure. :)
 

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