GMAT prep math

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Baten80: Junior | Next Rank: 30 Posts; Posts: 16; Joined: Sat Oct 03, 2009 8:57 pm

by Baten80 » Fri Aug 13, 2010 8:07 pm

2+2+2^2+2^3+2^4+2^5+2^6+2^7+2^8=?

Ans. 2^9

How?

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Source: Beat The GMAT — Problem Solving | Fri Aug 13, 2010 8:07 pm

selango: Legendary Member; Posts: 1460; Joined: Tue Dec 29, 2009 1:28 amFollowed by: 7 members; Thanked: 135 times

by selango » Fri Aug 13, 2010 8:45 pm

2+2+2^2+2^3+2^4+2^5+2^6+2^7+2^8=?

2^2+2^2+2^3+2^4+2^5+2^6+2^7+2^8

2^3+2^3+2^4+2^5+2^6+2^7+2^8

2^4+2^4+2^5+2^6+2^7+2^8

2^5+2^5+2^6+2^7+2^8

2^6+2^6+2^7+2^8

2^7+2^7+2^8

2^8+2^8=2^9

--Anand--

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