Dr. Emma Chen, a renowned mathematician, has set the international math community abuzz with her latest numerical sequence puzzle. This challenging brain teaser has stumped even the most brilliant ...

The missing number is 1,620. The digits in the tens places (green in the figure below) of the numbers in columns 1, 2, 4 and 5 are added together. The total value is represented by the digits in the ...

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E= (A+B) - (C-D) where A=7, B=5, C=6, and D=3 If you observe the sequence of table above, 1, 3, 5, 9, 11, 13 are increasing with a difference of 2 and 1, 2, 3, 5, 6 ...

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