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15 Oct 2019, 02:31
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E
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If the units digit of integer n is greater than 2, what is the units digit of n ?
(1) The units digit of n is the same as the units digit of n^2
(2) The units digit of n^2 is the same as the units digit of n^3
(1) The units digit of n is the same as the units digit of n^2
(2) The units digit of n^2 is the same as the units digit of n^3
15 Oct 2019, 02:35
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Bunuel
If the units digit of integer n is greater than 2, what is the units digit of n ?
(1) The units digit of n is the same as the units digit of n^2
(2) The units digit of n^2 is the same as the units digit of n^3
(1) The units digit of n is the same as the units digit of n^2
(2) The units digit of n^2 is the same as the units digit of n^3
(1) The units digit of n is the same as the units digit of n^2
--> Possible values of unit digit of n = 5, 6 --> Insufficient
(2) The units digit of n^2 is the same as the units digit of n^3
--> Possible values of unit digit of n = 5, 6 --> Insufficient
Combining (1) & (2),
Possible values of unit digit of n = 5, 6 --> Insufficient
IMO Option E
15 Oct 2019, 02:38
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Bunuel
If the units digit of integer n is greater than 2, what is the units digit of n ?
(1) The units digit of n is the same as the units digit of n^2
(2) The units digit of n^2 is the same as the units digit of n^3
(1) The units digit of n is the same as the units digit of n^2
(2) The units digit of n^2 is the same as the units digit of n^3
from 1 &2
only possible unit digit is 5,6
IMO E
