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Sudoku 10-20-30 (Fun With Sudoku #32)

This Sudoku type appeared in World Sudoku Championship 2011 and I created it for the practice to Indian Sudoku team. This is an easy Sudoku to give introduction to this Sudoku type.
I am re-posting this Sudoku 10-20-30 as my 32nd Sudoku in Fun With Sudoku Series.
Rules of Sudoku 10-20-30
Classic Sudoku Rules apply.  Additionally, the sum of any grey region equals to 10, 20 or 30.
Sudoku 10-20-30 (Fun With Sudoku #32)
Sudoku 10-20-30 (Fun With Sudoku #32)

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