Adding numbers with the same base and different exponents

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Abdulla: Master | Next Rank: 500 Posts; Posts: 328; Joined: Thu Aug 07, 2008 5:25 pm; Location: Philadelphia; Thanked: 4 times; GMAT Score:550

by Abdulla » Thu Dec 04, 2008 7:29 pm

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

A) 2^9
B) 2^10
C) 2^16
D) 2^35
E) 2^37

OA: A

we got 9 2s, so is that the only reason to choose 2^9

Abdulla

Source: Beat The GMAT — Problem Solving | Thu Dec 04, 2008 7:29 pm

cramya: Legendary Member; Posts: 2467; Joined: Thu Aug 28, 2008 6:14 pm; Thanked: 331 times; Followed by:11 members

by cramya » Thu Dec 04, 2008 9:55 pm

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