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Mini-sodoku

Stage: 3 and 4 Short Challenge Level: Challenge Level:1
 
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?





If you liked this problem, here is an NRICH task that challenges you to use similar mathematical ideas.



This problem is taken from the UKMT Mathematical Challenges.
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