Let N be the positive integer 7777 \ldots 777, a 313-digit number where each digit is a 7 . Let f(r) be the leading digit of the r th root of N. What is
f(2)+f(3)+f(4)+f(5)+f(6) ?
Answer Choices
A. 8
B. 9
C. 11
D. 22
E. 29
Let N be the positive integer 7777 \ldots 777, a 313-digit number where each digit is a 7 . Let f(r) be the leading digit of the r th root of N. What is
f(2)+f(3)+f(4)+f(5)+f(6) ?
Answer Choices
A. 8
B. 9
C. 11
D. 22
E. 29