Question

What is the 30th term of the arithmetic series 3, 7, 11, 15...?

Answer 1

`30` th term is `119`

Explanation:

`S={ 3,7,11,15....}` , first term is `a=3` , common difference

is `d=7-3=4 ; n` th term is `t_n =a+(n-1)d ; n=30`

`:. t_30 =3+(30-1)4=3+116=119`

`30` th term is `119` [Ans]