Find a30−a20 for the AP :a,a+d,a+2d,a+3d,...
Find a30−a20 for the A.P. (i) -9,-14,-19,-24,... (ii)a,a+d,a+2d,a+3d,...
For the AP –3, –7, –11,… can we find directly a30−a20 without actually finding a30 and a20? Give the reason for your answer.