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The answer is 12 every other numbers are odd numbers, but 12 is an even number

Q: Which one of the following numbers does not belong to the series 1 3 5 7 9 11 12 13 15?

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9 - all the rest are prime

Most probably 48.

3 ((9-2)(7+1)(8-2)(6+1)(7-2)(5+1))

N, because it is not in the first half of the alphabet.

The "pairs" in the sequence are doubles of themselves, e.g (1,2) , (5, 10), (13, 26) but for 29 and 48 neither are doubles or halves of each other. However I'm not sure how you know which of 29 or 48 is the odd one out.

Related questions

30

You could make a case for any of them.

8

9 - all the rest are prime

Most probably 48.

133 ,because all haveroot squares except 133

You have to find a pattern in the numbers, and exclude the one that messes up the pattern.

If the series is plus one, times two, plus one, times two, etc., the 8 does not belong.

1. It is the only one that is neither prime nor composite. It is the only one whose square (cube, higher powers) is the same as itself.

3 ((9-2)(7+1)(8-2)(6+1)(7-2)(5+1))

N, because it is not in the first half of the alphabet.

The answer is KThe letter should be L