Problem
1984 AHSME Problem 9
The number of digits in 4^{16}5^{25} (when written in the usual base 10 form) is
\mathrm{(A) \ }31 \qquad \mathrm{(B) \ }30 \qquad \mathrm{(C) \ } 29 \qquad \mathrm{(D) \ }28 \qquad \mathrm{(E) \ } 27
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