$13, 25, 61, 121, 205, (?)$

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.

$85$	$43$	$44$	$67.5$	$137$	$345$
$125$	$(a)$	$(b)$	$(c)$	$(d)$	$(e)$

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

$3, 15, ?, 63, 99, 143$

$512, 256, 128, 64, 32, ?$

Find the next term in the series: $15, 18, 16, 19, 17, 20, ?$

Find the odd number in the given sequence: $33, 321, 465, 537, 573, 590, 600$.