GMAT Prep (Preceding Terms) Pract2

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dferm: Master | Next Rank: 500 Posts; Posts: 446; Joined: Thu Jul 26, 2007 1:07 pm; Thanked: 6 times

by dferm » Tue May 13, 2008 12:28 pm

240, 120, 60, 30, ......

In the sequence above, each term after the first is 1/2 of the preceding term. What is the least term of the sequence that is greater than 1?

A. 32/15
B. 16/15
C. 15/8
D. 15/4
E. 15/2

Please Explain..

Thanks.

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Source: Beat The GMAT — Problem Solving | Tue May 13, 2008 12:28 pm

ptgbeauregard: Senior | Next Rank: 100 Posts; Posts: 41; Joined: Fri May 09, 2008 5:17 pm; Location: Bethesda, MD; Thanked: 4 times

by ptgbeauregard » Tue May 13, 2008 1:18 pm

30(1/2)=15/2
(15/2)(1/2)=15/4
(15/4)(1/2)=15/8
(15/8)(1/2)=15/16<1

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