Question

The` "n"^(th)` term of the A. P. 3, 8, 13, 18, ............ is 148. Find n 

Answer 1

The A. P. is 3, 8, 13, 18, ............
Let the nth term of the A. P. be 148.
a = 3, d = 5 and ` t_n` = 148

`t_n=a+(n-1)d` 

`148=3+(n-1)5` 

      =`3+5n-5` 

∴`5_n=148+2=150` 

∴` n=30` 

∴` 30^(th)  "term is"  148`