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

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