A mini-sudoku is a 4 by 4 grid, where each row, column and 2 by 2 outlined block contains the digits 1, 2, 3 and 4 once and once only.
How many different ways are there of completing the mini-sudoku shown?
Select one option, then click Submit.
1
2
4
8
12
Select an option, then submit.
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Senior Mathematical Challenge 2009 (2009)
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