Share Middle missing number, Numbers to 20
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3, __, 5?
4
8, __, 10?
9
15, __, 17?
16
2, __, 4?
3
10, __, 12?
11
5, __, 7?
6
13, __, 15?
14
1, __, 3?
2
12, __, 14?
13
7, __, 9?
8
16, __, 18?
17
4, __, 6?
5
9, __, 11?
10
6, __, 8?
7
14, __, 16?
15
11, __, 13?
12
