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05 Nov 2019, 05:58
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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:
55% (01:07) correct
45%
(01:07)
wrong
based on 190
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If a and b are integers, what is the value of a − b?
(1) a*b = 1
(2) a + b = 2
Are You Up For the Challenge: 700 Level Questions
(1) a*b = 1
(2) a + b = 2
Are You Up For the Challenge: 700 Level Questions
Pure algebraic questions like this one are no longer part of the GMAT Data Sufficiency syllabus.
For relevant Data Sufficiency questions, please check the Data Sufficiency forum:
Data Sufficiency Forum
Data Sufficiency Forum
Updated on: 05 Nov 2019, 06:54
Originally posted by Archit3110 on 05 Nov 2019, 06:34.
Last edited by Archit3110 on 05 Nov 2019, 06:54, edited 1 time in total.
Last edited by Archit3110 on 05 Nov 2019, 06:54, edited 1 time in total.
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Bunuel
#1
a*b = 1
a & b can be either both + or - 1
a-b=0 in both cases
sufficient
#2
a+b=2
2+0 ; 1+1
insufficient
IMO A
05 Nov 2019, 06:52
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Statement 1 - a*b = 1..
Possibly 1- both a and b are positive (+1)
a-b => 1-1 = 0
Possibility 2 - both a and b are negative (-1)
a-b = -1 -(-1) = -1+1 => 0
In either case, we get a-b = 0, sufficient
Statement 2- a+b = 2
a = 0, b= 2.. a-b = -2
a = 1, b= 1.. a-b = 0.
Two different answers, not sufficient..
A.
Posted from my mobile device
Possibly 1- both a and b are positive (+1)
a-b => 1-1 = 0
Possibility 2 - both a and b are negative (-1)
a-b = -1 -(-1) = -1+1 => 0
In either case, we get a-b = 0, sufficient
Statement 2- a+b = 2
a = 0, b= 2.. a-b = -2
a = 1, b= 1.. a-b = 0.
Two different answers, not sufficient..
A.
Posted from my mobile device
