$12, 28, 75, 316, 1555, ?$

Find the next term in the series: $20, 24, 36, 56, 84, ?$

Find the next term in the series: $1, 5, 13, 25, 41, ?$

In each of the following questions,a number series is given. After the series,a number is given followed by $(a), (b), (c), (d),$ and $(e).$ You have to complete the series starting with the number given,following the sequence of the original series and answer the questions that follow the series.

$7$	$91$	$1001$	$7007$	$35035$	$105105$
$14.5$	$(a)$	$(b)$	$(c)$	$(d)$	$(e)$

What will come in place of $(c)$ (in $.5$)?

If $A = \left(\frac{1}{0.4}\right) + \left(\frac{1}{0.04}\right) + \left(\frac{1}{0.004}\right) + \dots$ up to $8$ terms,then what is the value of $A$ (in $.5$)?

$123 \quad 140 \quad 106 \quad 157 \quad 89 \quad ?$