We can see, from the second number, a number is equal to its previous number plus 2.So, the next number after 9 will be 9 + 2 = 11, next is 11 + 2 = 13, etc.-> 1,3,5,7,9,11,13,15,17,...
Answer: 1, 3, 5, 7, 9, 11, 13, 15, 17, 19, 21, 23................
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