What will come in place of the question mark $(?)$ in the following number series?
$8, 27, 64, 125, 216, 343, ?$

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 $.5$)?

What will come in place of the question mark $(?)$ in the following number series?
$100, 99, 97, 94, 90, ?$

$325, 259, 204, 160, 127, 105, ?$

Find out the odd number from the given sequence: $1, 2, 6, 21, 84, 445, 2676$.

$35, 76, 253, 488, 911, ?$