Solution
In first number: The number is first added to same number.
In second number: The answer should added by 1.
1 + 1 = 2
2 + 1 = 3
3 + 3 = 6
6 + 1 = 7
7 + 7 = 14
14 + 1 = 15
15 + 15 = 30
So, 11 is odd number.
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