What is the units digit of (147^17)^47 ?	Pick one
A) 1 B) 3 C) 5 D) 7 E) 9
The units digit of the exponents of 7 repeat in a cycle of four, which is {7,9,3,1}. The number 17 has the form 4n+1 so the units digit is 7 inside the bracket. The exponent 47 has the form 4n+3, so the units digit is 3. The answer is 3.
<result>B</result>
What is the units digit of (147^17)^47 ?