$4, 12, 36, 108, ?$

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 same pattern as the original series.

$12$	$30$	$120$	$460$	$1368$	$2730$
$16$	$(a)$	$(b)$	$(c)$	$(d)$	$(e)$

What will come in place of $(d)?$

$1, 6, 36, 240, 1960, ?$

$980, 484, 236, 112, 50, ?, 3.5$

Find out the odd number from the given sequence:
$157.5 \quad 45 \quad 15 \quad 6 \quad 3 \quad 2 \quad 1$

Find out the odd number from the given sequence: $36, 64, 81, 125, 169$.