Question

Find t_n for the A.P. 3,8,13,18,.....

Answer 1

A.P : 3,8,13,18,.....

Here , a = 3

d = t₂ -t₁

= 8 - 3

d = 5

t_n = a + (n - 1)d

t_n = 3 + (n - 1)5

= 5n - 2

t_n = 5n - 2