Q. Write the correct number in the given boxes from the following A. P.
(i) 1, 8, 15, 22,...
Here a = , t1 = , t2 = , t3 = ,
t2 – t1 = – =
t3 – t2 = – = ∴ d =
(ii) 3, 6, 9, 12,...
Here t1 = , t2 = , t3 = , t4 = ,
t2 – t1 = , t3 – t2 = ∴ d =
(iii) –3, –8, –13, –18,...
Here t3 = , t2 = , t4 = , t1 = ,
t2 – t1 = , t3 – t2 = ∴ a = , d =
(iv) 70, 60, 50, 40,...
Here t1 = , t2 = , t3 = ,...
∴ a = , d =