What is the unit’s digit of 7^7 Choices:
A) 9
B) 5
C) 3
D) 7
E) 1
7^1=7   7^2=49   7^3=343   7^4=1(last digit)   7^5=7(last digit) and the cycle repeats after every 4 powers   Therefore, last digit of 7^7=3   Answer 3
<result>C</result>
What is the unit’s digit of 7^7