Find the odd number from the given sequence: $2, 6, 12, 72, 824$.

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 $.5$)?

$4, 10, 33, 136, 685, ?$

Find out the odd number from the given sequence: $455, 445, 465, 435, 485, 415, 475$.

$1, 11, 111, 1111, ?$

In the following number series,one of the numbers does not fit into the series. Identify the wrong number in the series.
$5 \quad 7.5 \quad 11.25 \quad 17.5 \quad 29.75 \quad 50 \quad 91.25$