12 13 ____ 15 16 9 10 ____ 13 14 ____ 1 ____ 3 4 2 3 4 ____ 6 7 8 ____ 10 ____ 13 14 15 17 18 ____ 20 3 ____ 5 6 7 5 6 7 ____ 9 10 11

Missing number to 20

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