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1*2*4+ 4*2*8 + 3*6*12.......+10*20*40 =? a) 88020 b) 44000 c)24200 d)55150
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1*2*4+ 4*2*8 + 3*6*12.......+10*20*40 =?
a) 88020 b) 44000 c)24200 d)55150

User Joko Wandiro
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C) 24200
I have done by brute force. But could you tell me the name of this theory please to study it? Thank you.
User Zhong
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