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1 + 2 + 3 + 5 + 7 + 9 =

... assuming you mean "positive numbers".

Also, the phrasing could be taken in 3 ways.

Prime AND odd numbers would be the intersect of 2 groups, being 1+3+5+7, which totals 16.

What is in both sets, but not counting the overlap twice, being 1+2+3+5+7+9, which is 27.

or finally, taking them both as independent sets of data, being 1+1+2+3+3+5+5+7+7+9, which is 43

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Q: What is sum of prime and odd numbers which are less than 10?
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