$10, 15, 15, 12.5, 9.375, 6.5625, ?$

Find out the odd number from the given sequence: $69, 68, 65, 60, 54, 44$.

$0, 4, 6, 3, 7, 9, 6, ?, 12$

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 $(d)?$

Observe the following table and determine which number will come in place of $(D)$:

$848$	$420$	$206$	$99$	$45.5$
$664$	$(A)$	$(B)$	$(C)$	$(D)$	$(E)$

In the following number series,only one number is wrong. Find out that wrong number:
$2, 6, 30, 210, 2520, 20790$