Answers

2015-05-01T11:25:15+05:30
Odd numbers don't add up to give you an even number.
It is possible only in case of factorial.

3! + 15 + 9 = 30
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2015-05-01T11:27:25+05:30
The sum of three odd numbers gives an odd number
So, the sum of 3 given odd numbers doesnt results 30
So, it is an impossible factor
here we can't use 3! too
because 3! [3×2×1] results a even number 6
so we cant use it.
If there will be an allowance of factorials, then the answers will be
3! + 15 + 9 =30

3! + 11 + 13 = 30
5 5 5