Problem Solving...Help

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ramonsa: Senior | Next Rank: 100 Posts; Posts: 30; Joined: Sun Jul 13, 2008 12:44 pm; Location: USA

by ramonsa » Wed Jun 03, 2009 3:02 pm

13. If a sequence of 8 consecutive odd integers with increasing values has 9 as its 7th term, what is the sum of the terms of the sequence?
(A) 22 (B) 32 (C) 36
(D) 40 (E) 44
Thanks..

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Source: Beat The GMAT — Data Sufficiency | Wed Jun 03, 2009 3:02 pm

syr: Senior | Next Rank: 100 Posts; Posts: 38; Joined: Fri Feb 20, 2009 8:45 am; Thanked: 5 times

by syr » Wed Jun 03, 2009 5:33 pm

Sequence of 8 consecutive odd intergers where 9 is the 7th term is

-3 -1 1 3 5 7 9 11
(7th term)

Place the 7th term and fill in the rest. We know that they are consecutive odd integers.

Summing the above sequence will give us 32.

HTH

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ramonsa: Senior | Next Rank: 100 Posts; Posts: 30; Joined: Sun Jul 13, 2008 12:44 pm; Location: USA

by ramonsa » Wed Jun 03, 2009 5:55 pm

Why do you use 11 instead of -5.
Thanks

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