What is the units digit of (147^17)^48 ?
Choose the most appropriate option:  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 48 has the form 4n, so the units digit is 1. The answer is 1.
<result>A</result>
What is the units digit of (147^17)^48 ?