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Sequence of positive numbers

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Senior | Next Rank: 100 Posts
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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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Source: — Data Sufficiency |
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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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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 :-)
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by gmat740 » Tue Apr 07, 2009 1:01 pm
Thanks Bondu :D
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