16,25,36,72,144,196,225
Options:
(A) 36
(B) 196
(C) 225
(D) 144
(E) 72 OK. Let's think. Some random thoughts first:

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
Each of the numbers except 72 is a perfect squar The answer: (E).