Question 151
Let $n$ be a positive integer such that the decimal representation of $2^{n}$ begins with the digit 7 (that is, its leftmost nonzero digit is 7). With which digit does the decimal representation of $5^{n}$ begin?
(A) 1
(B) 2
(C) 5
(D) 7
(E) It depends on $n$
(A) 1
(B) 2
(C) 5
(D) 7
(E) It depends on $n$