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# If in sequence a, an = 3an–1 and a2 = 5, what is the value of a4?

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Senior RC Moderator
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If in sequence a, an = 3an–1 and a2 = 5, what is the value of a4?  [#permalink]

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Updated on: 21 May 2019, 20:59
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100% (00:55) correct 0% (00:00) wrong based on 17 sessions

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If in sequence a, $$a_n = 3a_{n–1}$$ and $$a_2 = 5$$, what is the value of $$a_4?$$

A. $$\frac{5}{3}$$

B. 5

C. 15

D. 30

E. 45

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23.jpg [ 14.85 KiB | Viewed 219 times ]

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Originally posted by SajjadAhmad on 21 May 2019, 16:39.
Last edited by Bunuel on 21 May 2019, 20:59, edited 1 time in total.
Formatted.
VP
Status: Learning stage
Joined: 01 Oct 2017
Posts: 1009
WE: Supply Chain Management (Energy and Utilities)
Re: If in sequence a, an = 3an–1 and a2 = 5, what is the value of a4?  [#permalink]

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21 May 2019, 17:46
SajjadAhmad wrote:
If in sequence $$a, an = 3an–1$$ and $$a2 = 5$$, what is the value of $$a4?$$

A. $$\frac{5}{3}$$

B. 5

C. 15

D. 30

E. 45

Could you please check the question?
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PKN

Rise above the storm, you will find the sunshine
Senior RC Moderator
Status: Preparing GMAT
Joined: 02 Nov 2016
Posts: 2763
Location: Pakistan
GPA: 3.39
Re: If in sequence a, an = 3an–1 and a2 = 5, what is the value of a4?  [#permalink]

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21 May 2019, 17:58
Kindly refresh the page i have added screenshot.

PKN wrote:
SajjadAhmad wrote:
If in sequence $$a, an = 3an–1$$ and $$a2 = 5$$, what is the value of $$a4?$$

A. $$\frac{5}{3}$$

B. 5

C. 15

D. 30

E. 45

Could you please check the question?

_________________
New Project RC Butler 2019 - Practice 2 RC Passages Everyday
Final days of the GMAT Exam? => All GMAT Flashcards.
This Post Helps = Press +1 Kudos
Best of Luck on the GMAT!!
VP
Status: Learning stage
Joined: 01 Oct 2017
Posts: 1009
WE: Supply Chain Management (Energy and Utilities)
Re: If in sequence a, an = 3an–1 and a2 = 5, what is the value of a4?  [#permalink]

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21 May 2019, 18:06
$$a_4$$=3$$a_3$$=3*3$$a_2$$=9*5=45

Ans.(E)
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PKN

Rise above the storm, you will find the sunshine
Re: If in sequence a, an = 3an–1 and a2 = 5, what is the value of a4?   [#permalink] 21 May 2019, 18:06
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# If in sequence a, an = 3an–1 and a2 = 5, what is the value of a4?

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