Skip to content / Đến nội dung
ThichHocToan.com

2011 AMC 12B Question 17

AMC12 · 2011 AMC 12B

Question 17

Let $f(x)=10^{10x},$ $g(x)=\log_{10}\!\left(\dfrac{x}{10}\right),$ $h_1(x)=g(f(x)),$ and $h_n(x)=h_1(h_{n-1}(x))$ for integers $n\ge2.$ What is the sum of the digits of $h_{2011}(1)?$
  1. $16{,}081$
  2. $16{,}089$
  3. $18{,}089$
  4. $18{,}098$
  5. $18{,}099$