MEDIUM Sudoku Puzzles M11-M20

Medium Sudoku Puzzle M11
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Medium Sudoku Puzzle M12
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Medium Sudoku Puzzle M13
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Medium Sudoku Puzzle M14
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Medium Sudoku Puzzle M15
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Medium Sudoku Puzzle M16
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Medium Sudoku Puzzle M17
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Medium Sudoku Puzzle M18
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Medium Sudoku Puzzle M19
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Medium Sudoku Puzzle M20
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Solutions for above 10 Medium sudoku puzzles M11 to M20 can be found Here.

Objective:

Fill in the 9×9 grid so that each row, column, and 3×3 subgrid contains all of the numbers from 1 to 9, without any repetition.

Rules:

Each row must contain all the numbers from 1 to 9 without repetition.
Each column must contain all the numbers from 1 to 9 without repetition.
Each 3×3 subgrid (box) must contain all the numbers from 1 to 9 without repetition.