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(7^6) + (7^8) =

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Expert Post
Magoosh GMAT Instructor
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Joined: 28 Dec 2011
Posts: 2449
Followers: 791

Kudos [?]: 3162 [0], given: 38

(7^6) + (7^8) = [#permalink] New post 19 Sep 2012, 12:44
Expert's post
00:00
A
B
C
D
E

Difficulty:

  5% (low)

Question Stats:

91% (01:35) correct 9% (00:29) wrong based on 67 sessions
(7^6) + (7^8) =

(A) 7^14
(B) 7^16
(C) 7^48
(D) 14^14
(E) (50)*(7^6)

See a full discussion of this question and the underlying ideas at:
http://magoosh.com/gmat/2012/adding-and ... -the-gmat/
[Reveal] Spoiler: OA

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Mike McGarry
Magoosh Test Prep

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Last edited by Bunuel on 19 Sep 2012, 14:57, edited 1 time in total.
Renamed the topic.
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Expert Post
Math Expert
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Joined: 02 Sep 2009
Posts: 28717
Followers: 4571

Kudos [?]: 47110 [0], given: 7104

Re: (7^6) + (7^8) = [#permalink] New post 19 Sep 2012, 14:55
Expert's post
mikemcgarry wrote:
(7^6) + (7^8) =

(A) 7^14
(B) 7^16
(C) 7^48
(D) 14^14
(E) (50)*(7^6)

See a full discussion of this question and the underlying ideas at:
http://magoosh.com/gmat/2012/adding-and ... -the-gmat/


Factor out \(7^6\) --> \(7^6+7^8=7^6(1+7^2)=7^6*50\).

Answer: E.
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Re: (7^6) + (7^8) =   [#permalink] 19 Sep 2012, 14:55
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