Thursday, September 7, 2017

Tricky Math Brain Riddle

1 comment:

  1. 3x2 + (2-1) = 7
    5x4 + (4-1) = 23
    7x6 + (6-1) = 47
    9x8 + (8-1) = 79
    10x9 + (9-1) = 98 <- answer

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