Consecutive puzzles: Are these invalid?

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Consecutive puzzles: Are these invalid?

Postby enxio27 » Mon Aug 05, 2013 8:51 pm

I've tried a couple of times to work these puzzles, but I keep coming up with multiple solutions for each of them. Am I making a mistake somewhere? I don't know of a software program I can put them into to test them out. These are puzzles from the now-defunct Sudoku Magazine's Sudoku Mix #1:

#38:

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#40:

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enxio27
 
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