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DS question. Need an explaination

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Source: — Data Sufficiency |
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Re: DS question. Need an explaination

by Morgoth » Sat Sep 27, 2008 5:13 pm
xunil56 wrote:Hi,

Can someone provide an explanation for the following DS question:

Image
Question stem :

k3 = k2+k1
k4 = k3+k2
k5 = k4+k3
so on and so forth

k5 = 18, k9=?

Statement (1) k4 = 11

k6 = k5+k4 = 11+18 = 29

now you can easily find the values of all the terms,
k7=k6+k5 = 29+18 = 47
k8=k7+k6 = 29+47
k9=k8+k7
Sufficient.

Statement (2) similarly, with k5=18 & k6=29, you can easily find the value of k9 using above sequence, Sufficient.

Thus, D is the answer.
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