If n is an integer and n^4 is divisible by 20, which of the following could be the remainder when n is divided by 20?	Choose the most appropriate option.
A) 5 B) 10 C) 12 D) 16 E) 18
option 1   Remainder 5 means  20+5= 
<gadget id="calculator"> 20+5</gadget>
<output>25</output>
25   n^4= 25^4= 25*25*25*25/20 is not an integer   option 2   Remainder 10 means  20+10= 
<gadget id="calculator"> 20+10</gadget>
<output>30</output>
30   n^4= 30*30*30*30/20 is an integer means n^4 is divisible by 20 if we take n=10   so 10 is correct
<result>B</result>
If n is an integer and n^4 is divisible by 20, which of the following could be the remainder when n is divided by 20?