Sequence of positive numbers

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Baldini: Senior | Next Rank: 100 Posts; Posts: 90; Joined: Mon Mar 02, 2009 6:06 am; Thanked: 3 times

by Baldini » Tue Apr 07, 2009 6:01 am

Dear all,
could someone kindly explain how to get to the OA (which is C).

Thanks in advance

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GMAX

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Source: Beat The GMAT — Data Sufficiency | Tue Apr 07, 2009 6:01 am

gmat740: MBA Student; Posts: 1194; Joined: Sat Aug 16, 2008 9:42 pmFollowed by: 17 members; Location: Paris, France; Thanked: 71 times; GMAT Score:710

by gmat740 » Tue Apr 07, 2009 7:39 am

St-I:

Xi = Xi-1/2

this does not give suff info regarding X1 because we need to know x2

No St : II

again insuff because even if we know this relationship,we cannot go ahead and find X1

now combine both

put X5 = X4/2(from St-I)

in St-II

X4=1

X3 = 1/2
X2 = 1/4
X1 = 1/8

So answer is C

Hope now it is clear

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cubicle_bound_misfit: Master | Next Rank: 500 Posts; Posts: 246; Joined: Mon May 19, 2008 7:34 am; Location: Texaco Gas Station; Thanked: 7 times

by cubicle_bound_misfit » Tue Apr 07, 2009 11:41 am

GMAT740,

only one addition

combining 1 and 2 X4 = 0 is discarded as the sequence consists of positive numbers only.

Baki ta byapak namiyecho

Cubicle Bound Misfit

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gmat740: MBA Student; Posts: 1194; Joined: Sat Aug 16, 2008 9:42 pmFollowed by: 17 members; Location: Paris, France; Thanked: 71 times; GMAT Score:710

by gmat740 » Tue Apr 07, 2009 1:01 pm

Thanks Bondu

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