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marmar29: Senior | Next Rank: 100 Posts; Posts: 61; Joined: Mon Feb 14, 2011 11:39 pm

by marmar29 » Tue Aug 23, 2011 6:15 am

1,6,21 , ....
a 63
b 64
e 65
d 66
e 67
thanks

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Source: Beat The GMAT — Problem Solving | Tue Aug 23, 2011 6:15 am

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Anurag@Gurome: GMAT Instructor; Posts: 3835; Joined: Fri Apr 02, 2010 10:00 pmFollowed by: 523 members; Location: Milpitas, CA; Thanked: 1854 times; GMAT Score:770

by Anurag@Gurome » Tue Aug 23, 2011 6:18 am

marmar29 wrote:1,6,21 , ...

6 = 3*(1 + 1)
21 = 3*(6 + 1)

Hence, the term can be 3*(21 + 1) = 66

The correct answer is D.

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