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28 Mar 2023, 01:30
Kudos
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C
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Difficulty:
15%
(low)
Question Stats:
76% (00:58) correct
24%
(01:08)
wrong
based on 83
sessions
History
Date
Time
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Not Attempted Yet
What is the units digit of positive integer y?
(1) The units digit of y^2 is 1
(2) The units digit of y does not equal 1
(1) The units digit of y^2 is 1
(2) The units digit of y does not equal 1
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
28 Mar 2023, 02:32
Kudos
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Bunuel
Statement 1
(1) The units digit of y^2 is 1
The unit digit of y can be either 1 or the unit digits can be 9.
The statement is not sufficient to answer the question.
Hence, we can eliminate A and D.
Statement 2
(2) The units digit of y does not equal 1
Not sufficient, as the unit digit can be any integer between 2 and 9, both inclusive.
We can eliminate B.
Combined
From statements 1 and 2, we can conclude that the unit digit = 9.
Sufficient.
Option C
