80 370 860 1550 ? 3530
Choose the most appropriate option:
A) 900 B) 2440 C) 750 D) 244 E) 960
10^2 - 20 = 80   20^2 - 30 = 370   30^2 - 40 = 860   40^2 - 50 = 1550   50^2 - 60 = 2440   60^2 - 70 = 3530.   ANSWER:2440
<result>B</result>
80 370 860 1550 ? 3530