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30 Apr 2021, 01:30
Kudos
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C
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
25%
(medium)
Question Stats:
67% (00:44) correct
33%
(00:54)
wrong
based on 66
sessions
History
Date
Time
Result
Not Attempted Yet
Bunuel
Given: a^2 = a
a^2 - a = 0
a(a-1) = 0
a = 0, a = 1
1) a^2 -2a = 0
a(a-2) = 0
a = 0, a = 2 (Insufficient)
2) a ≠ 2
Insufficient
Combining 1 & 2:
a = 0. Hence, C
30 Apr 2021, 01:51
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Question asks whether a^2=a.
Let us simplify the question.
a^2-a=0
a(a-1)=0
The question stem asks whether a is 0 or 1.
Statement 1:a^2 = 2a
a^2-2a=0
a(a-2)=0
a is 0 or 2. There is no definitive answer to the question stem. INSUFFICIENT
Statement 2:a ≠ 2
No details on "a" other than the fact that a is not 2. INSUFFICIENT
Combining statements 1&2.
St1:a is either 0 or 2
St2 a is not 2
Therefore a is 0. And the answer to question is a YES.
ANS: C
Posted from my mobile device
Let us simplify the question.
a^2-a=0
a(a-1)=0
The question stem asks whether a is 0 or 1.
Statement 1:a^2 = 2a
a^2-2a=0
a(a-2)=0
a is 0 or 2. There is no definitive answer to the question stem. INSUFFICIENT
Statement 2:a ≠ 2
No details on "a" other than the fact that a is not 2. INSUFFICIENT
Combining statements 1&2.
St1:a is either 0 or 2
St2 a is not 2
Therefore a is 0. And the answer to question is a YES.
ANS: C
Posted from my mobile device
