14) Yesterday, Pierino had fun adding up the odd numbers from 1 up to a certain value. Which of the following sums is definitely incorrect?
(A) 625
(B) 1225
(C) 2025
(D) 3025
(E) 4525.
14) The answer is $\mathbf{( E )}$. The sum of the first $n$ odd numbers is $n^{2}$. The correct answer is therefore a number that is not a perfect square. We have $625=25^{2}, 1225=35^{2}, 2025=45^{2}, 3025=55^{2}$, $4525=5^{2} \cdot 181$. The only one of these that is not a perfect square is 4525.