Question

Insert $20$ AM between $2$ and $86$.Then find first mean.

Answer 1

Here $2$ is the first term and $86$ is the ${22}^{nd}$ term of AP
So, $86=2+\left(21\right)d$
$21d=84$
$\Rightarrow d=4$
So the series is $2,6,10,14,......,82,86$
$\therefore$ required means are $6,10,14,.....,82$