What is the least number of digits (including repetitions) needed to express 10^500 in decimal notation?	Choose the correct choice from the following answers: A) a) 4 B) b) 100 C) c) 101 D) d) 501 E) e) 1001
10^n is a decimal number with a 1 followed by n zeros.   So 10^500 will include 500 0's + 1 digit for 1 = 501   So the answer is d) 501.
<result>D</result>
What is the least number of digits (including repetitions) needed to express 10^500 in decimal notation?