Find the next number in the series: $12, 12, 18, 36, 90, 270, ?$

$4, 200, 369, 513, 634, ?$

$3, 20, 87, 392, ?$

$3, 6, 21, 28, 55, 66, ?, 120$

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 $.5$)?

In the following number series,a wrong number is given. Find out that wrong number.
$4\quad2\quad3.5\quad7.5\quad26.25\quad118.125$