Question

Find the ${17}^{th}$ term of the AP : $4,9,14$......

Answer 1

Given A.P. series is $4,9,14,....$

Thus, we have $a=4,d=5$

We need to find $t_{17}$

Thus, $n=17$

$t_n=a_n+(n-1)d$

$\Rightarrow t_{17}=4+(17-1)5$

$=4+16\times 5$

$=4+80$

$=84$