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27 Sep 2019, 10:35
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A
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
45%
(medium)
Question Stats:
59% (01:36) correct
41%
(01:29)
wrong
based on 57
sessions
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Date
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What is the value of integer n ?
(1) \((n - 2)^n = 243\)
(2) \(n(n - 2) = 15\)
(1) \((n - 2)^n = 243\)
(2) \(n(n - 2) = 15\)
27 Sep 2019, 19:46
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Statement 1-
\((n-2)^n=243\)
\((n-2)^n=3^5\)
n=5
Sufficient
Statement 2-
n(n-2)=15
\(n^2-2n-15=0\)
(n-5)(n+3)=0
n=5 or -3
Insufficient
\((n-2)^n=243\)
\((n-2)^n=3^5\)
n=5
Sufficient
Statement 2-
n(n-2)=15
\(n^2-2n-15=0\)
(n-5)(n+3)=0
n=5 or -3
Insufficient
Dillesh4096
What is the value of integer n ?
(1) \((n - 2)^n\) = 243
(2) n(n - 2) = 15
Posted from my mobile device
(1) \((n - 2)^n\) = 243
(2) n(n - 2) = 15
Posted from my mobile device
28 Sep 2019, 02:35
Kudos
Bookmarks
Dillesh4096
What is the value of integer n ?
(1) \((n - 2)^n\) = 243
(2) n(n - 2) = 15
Posted from my mobile device
(1) \((n - 2)^n\) = 243
(2) n(n - 2) = 15
Posted from my mobile device
given n is an integer
(1) \((n - 2)^n\) = 243
possible for n =5
3^5=243
sufficient
#2
n(n - 2) = 15
can be valid for n=5 and n=-3
insufficient
IMO A
