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19 May 2021, 08:30
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E
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
65%
(hard)
Question Stats:
38% (01:07) correct
62%
(01:16)
wrong
based on 74
sessions
History
Date
Time
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Not Attempted Yet
19 May 2021, 08:36
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Asked: What is the value of x ?
(1) \(a^{(2x)}=b^{(x+6)}\)
Since relation between a & b is unknown
NOT SUFFICIENT
(2) \(ab = 1\)
There is no information given about x.
NOT SUFFICIENT
(1) + (2)
(1) \(a^{(2x)}=b^{(x+6)}\)
(2) \(ab = 1\)
\(a = b^{-1}\)
\(b^{-2x} = b^{x+6}\)
-2x = x +6
x = -2
SUFFICIENT
IMO C
(1) \(a^{(2x)}=b^{(x+6)}\)
Since relation between a & b is unknown
NOT SUFFICIENT
(2) \(ab = 1\)
There is no information given about x.
NOT SUFFICIENT
(1) + (2)
(1) \(a^{(2x)}=b^{(x+6)}\)
(2) \(ab = 1\)
\(a = b^{-1}\)
\(b^{-2x} = b^{x+6}\)
-2x = x +6
x = -2
SUFFICIENT
IMO C
19 May 2021, 09:32
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Kinshook what if we have fraction values of A or B .
let say a=1/2 b = 2 then ans would be E because a and b can be non integer also.
let say a=1/2 b = 2 then ans would be E because a and b can be non integer also.
