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

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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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New post Updated on: 21 May 2019, 20:59
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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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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.
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Re: If in sequence a, an = 3an–1 and a2 = 5, what is the value of a4?  [#permalink]

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New post 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

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Senior RC Moderator
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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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New post 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
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Status: Learning stage
Joined: 01 Oct 2017
Posts: 1009
WE: Supply Chain Management (Energy and Utilities)
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Re: If in sequence a, an = 3an–1 and a2 = 5, what is the value of a4?  [#permalink]

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New post 21 May 2019, 18:06
\(a_4\)=3\(a_3\)=3*3\(a_2\)=9*5=45

Ans.(E)
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PKN

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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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