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21 Mar 2021, 08:13
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B
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
35%
(medium)
Question Stats:
51% (00:40) correct
49%
(00:39)
wrong
based on 84
sessions
History
Date
Time
Result
Not Attempted Yet
21 Mar 2021, 08:47
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Is x a positive integer?
1. x^2 -1 =0
\(x^2=1\)
So, x can be 1 or -1.
Insufficient
2. x<1
The least value of a positive integer is 1, but x<1.
Thus, x will never be a positive integer.
Sufficient
B
1. x^2 -1 =0
\(x^2=1\)
So, x can be 1 or -1.
Insufficient
2. x<1
The least value of a positive integer is 1, but x<1.
Thus, x will never be a positive integer.
Sufficient
B
21 Mar 2021, 09:22
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Asked: Is x a positive integer?
1. x^2 -1 =0
(x-1)(x+1) =0
x = 1 or -1
NOT SUFFICIENT
2. x<1
Least value of a positive integer = 1
Since x<1; x is NOT a positive integer.
IMO B
1. x^2 -1 =0
(x-1)(x+1) =0
x = 1 or -1
NOT SUFFICIENT
2. x<1
Least value of a positive integer = 1
Since x<1; x is NOT a positive integer.
IMO B
