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piyush_nitt
- Master | Next Rank: 500 Posts
- Posts: 424
- Joined: Sun Dec 07, 2008 5:15 pm
- Location: Sydney
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It's E.
1. We have only + and * so we can safely say it doesn't matter if we swap places or no.
2. Is obvious
3. As 1 we can safely say we can do this since with + and with * we can do this kinds of swapping.
1+2+3=2+3+1
1*2*3=2*3*1
If we had - or / somewhere on the other hand.. but we don't.
1st I did this the long way btw.
a+b-ab+c-ca-cb+cab=a+b+c-bc-ab-ac+cab before I realized we are dealing only with + and *. And with + and - we can swap all we want.
