Question 150
The first three terms of a geometric sequence are the integers $a$, $720$, and $b$, where $a \lt 720 \lt b$. What is the sum of the digits of the least possible value of $b$?
(A) 9 (B) 12 (C) 16 (D) 18 (E) 21
(A) 9 (B) 12 (C) 16 (D) 18 (E) 21