Write the first three terms in each of the following sequences defined by the following:
$a_{n} = 2n + 5$

The sum of the series $\frac{1}{2} + \frac{1}{3} + \frac{1}{6} + \dots$ to $9$ terms is

The $8^{th}$ term of the series $2\sqrt{2} + \sqrt{2} + 0 + \dots$ will be: (in $\sqrt{2}$)

If the middle term of the $AP$ is $300$,then the sum of its first $51$ terms is

If $S_k$ denotes the sum of the first $k$ terms of an arithmetic progression whose first term and common difference are $a$ and $d$ respectively,then $S_{kn}/S_n$ is independent of $n$ if

If $a, b, c$ are in Arithmetic Progression,then $(a - c)^2 = \dots$