If n is a one-digit positive integer, what is n ?

BTGmoderatorDC wrote: ↑
Thu Jan 06, 2022 9:01 pm
If n is a one-digit positive integer, what is n ?

(1) The units digit of 4^n is 4.
(2) The units digit of n^4 is n.

OA E

Source: Manhattan Prep

$n={1,2,3,4,5,6,…9}$

1) Insufficient
$4^n$ units $4: n={1,5,9}$

2) Insufficient
$n^4$ units $n: n={1,5,6}$

1 and 2 combined, insufficient
$n={1,5}$

Therefore, E

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