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# 1) If 9x = 27^y, which of the following expresses x in terms

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Director
Joined: 27 Jun 2008
Posts: 527
WE 1: Investment Banking - 6yrs
1) If 9x = 27^y, which of the following expresses x in terms [#permalink]

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29 Sep 2008, 06:21
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1) If 9x = 27^y, which of the following expresses x in terms of y?
A. 3^y
B. 3^y-1
C. 3^2y-1
D. 3^2y-3
E. 3^3y-2

2) In the sequence 1, 2, 4, 8, 16, 32, … , each term after the first is twice the previous term. What is
the sum of the 16th, 17th, and 18th terms in the sequence?
A. 2^18
B. 3 (2^17)
C. 7 (2^16)
D. 3 (2^16)
E. 7 (2^15)

Last edited by pm4553 on 29 Sep 2008, 07:00, edited 1 time in total.
VP
Joined: 30 Jun 2008
Posts: 1022
Re: PS - Q 1 & 2 [#permalink]

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29 Sep 2008, 06:36
pawan203 wrote:
1) If 9x = 27y, which of the following expresses x in terms of y?
A. 3^y
B. 3^y-1
C. 3^2y-1
D. 3^2y-3
E. 3^3y-2

2) In the sequence 1, 2, 4, 8, 16, 32, … , each term after the first is twice the previous term. What is
the sum of the 16th, 17th, and 18th terms in the sequence?
A. 2^18
B. 3 (2^17)
C. 7 (2^16)
D. 3 (2^16)
E. 7 (2^15)

1) have you posted the question correctly or am i missing anything ??

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"You have to find it. No one else can find it for you." - Bjorn Borg

Director
Joined: 27 Jun 2008
Posts: 527
WE 1: Investment Banking - 6yrs
Re: PS - Q 1 & 2 [#permalink]

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29 Sep 2008, 07:03

Also, can you explain how you arrived at E for 2). It took a while to arrive at the answer, but I would like to know the shortest method?
Re: PS - Q 1 & 2   [#permalink] 29 Sep 2008, 07:03
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