Missouri State University's High School Problem Page
	Barth's Sixth-Degree Surface rendered by Tore Nordstrand

The grid below can be completed by entering the numbers 1,2,3,4, or 5 into each square so that every digit appears exactly once in each row, in each column, and along the two main diagonals.

• What number must go into the middle square?

• How many ways can the grid be completed?

Source: U.K. Schools Mathematical Challenge

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This page is maintained by Les Reid. Last updated 2-05-10.