N= 1!+2!+3!.....+10!. what is the last digit of N^N? Choose the correct choice.
A) 3
B) 4
C) 5
D) 6
E) 7
as you see 5! till 10 ! each unit digit is zero.   so 1!+2!+3!+4! =33   so unit digit   3+ 0= 
<gadget id="calculator">  3+ 0</gadget>
<output>3</output>
3   N=3   N^N= 3^3=27   so last digit is 7.   ANSW7R:7
<result>E</result>
N= 1!+2!+3!.....+10!. what is the last digit of N^N?