Prof. Giray Okten

Monday, February 16, 2009

Week 2 - Problem 1

The square in the figure is a mini-sudoku: the numbers 1, 2, and 3 must be written in the cells so that each of them appears in each row and in each column. Harry started to fill in the square. In how many ways can he complete the task?

A) 1 B) 2 C) 3 D) 4 E) 5