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Difficulty:
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78% (01:00) correct
23%
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If y is a positive integer, what is the units digit of y?
(1) The units digit of y^2 = 1
(2) The units digit of y does not equal 1
(1) The units digit of y^2 = 1
(2) The units digit of y does not equal 1
Archit3110
Major Poster
23 Mar 2022, 07:37
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given y is a +ve integer ; not a restriction that its single digit
#1
The units digit of y^2 = 1
y can be 1,9,11,21...
insufficient
#2
The units digit of y does not equal 1
possible any other value except 1 , insufficient
from 1 &2
y has to be 9
sufficient
option C
#1
The units digit of y^2 = 1
y can be 1,9,11,21...
insufficient
#2
The units digit of y does not equal 1
possible any other value except 1 , insufficient
from 1 &2
y has to be 9
sufficient
option C
Bunuel
