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# What is the units digit of of the positive integer y?

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Math Expert
Joined: 02 Sep 2009
Posts: 52431
What is the units digit of of the positive integer y?  [#permalink]

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26 Nov 2017, 23:08
00:00

Difficulty:

25% (medium)

Question Stats:

77% (00:42) correct 23% (01:01) wrong based on 52 sessions

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What is the units digit of the positive integer y?

(1) The units digit of y^2 = 1

(2) The units digit of y does not equal 1.

Corrected MGMAT question.

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Joined: 18 Aug 2016
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Concentration: Strategy, Technology
GMAT 1: 630 Q47 V29
GMAT 2: 740 Q51 V38
Re: What is the units digit of of the positive integer y?  [#permalink]

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26 Nov 2017, 23:11
Bunuel wrote:
What is the units digit of the positive integer y?

(1) The units digit of y^2 = 1

(2) The units digit of y does not equal 1.

Corrected MGMAT question.

We know y is a positive integer

(1) now since y^2 = 1
unit digit of y can be 1 or 9
not sufficient

(2) not sufficient

on combining unit digit of y = 9
C
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Luckisnoexcuse

Re: What is the units digit of of the positive integer y? &nbs [#permalink] 26 Nov 2017, 23:11
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# What is the units digit of of the positive integer y?

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