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But its not... just the same as 3x3c3 is not 27 in the question. If we follow the rule above my guess is that

  • 7x7x7=50
  • 8x8x8=60
  • 9x9x9=72

729 would be (9x9)x9 am I right?

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Just came upon this and was wondering if your answer was 90. Have a great day

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