-
cveluswamy
- Junior | Next Rank: 30 Posts
- Posts: 16
- Joined: Tue Mar 20, 2007 6:02 am
Keep factoring out 2's until you see a pattern:
2+2+2^2+2^3+...+2^8
2(1+1+2+2^2+2^3+...+2^7)
2*2(1+1+2+2^2+2^3+...+2^6)
...
2*2*2*2*2*2*2*2*2
=2^9
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