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Answer:
This question is too difficult...
Solution :-
Since it is impossible for 3 odd numbers add up to an even number. We have to use another trick rather than trying pairs of given numbers.
We may create odd numbers as even :-
(11–1)+(13–3)+(15–5)=30.
Another approach, use factorials :-
3! + 9 + 15 = 30
n! is a mathematical notation to represent n × (n-1) × (n-2) × (n-3) . . . 3 × 2 × 1.
These two possible cases, I do know!