Which numbers will come next in the following series?
$1, 8, 9, 64, 25, 216, ?, ?$

Find the missing term in the following series:

$\mathrm{C}4\mathrm{X}, \mathrm{F}9\mathrm{U}, \mathrm{I}16\mathrm{R}, ?$

The diagram below is a 'magic square' in which all rows and columns and both diagonals add up to $34$. Find $\mathrm{xy}$?

Complete the above magic square so that the rows, columns, diagonals - all add to the same number and then find $\mathrm{A}+\mathrm{B}$?