Key Takeaways — Number Systems (Part I)
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There are many solutions to this. As all the no.s are odd adding all of them would generate an add no. only. So we have to generate one or three even no.s to get to the answer.

Generating three even is already told by Sneha Krishnam.

And examples for getting the required answer with generating one even no. would be : 9+1+(15–5)=30, 9+1+(13–3)=30, 9+1+(11–1)=30, etc..

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