Find the next term of the series:
D, I, L, Q, T, Y, B, G,?

Complete the following series:

$6.25, 9, 12.25, 16, 20.25, 25, 30.25, ?$

Which sequence of letters when placed at the blanks one after another will complete the given letter series?

_aba_cabc_dcba_bab_a

Choose the missing term out of the given alternatives:

$\mathrm{J}2\mathrm{Z}, \mathrm{K}4\mathrm{X}, \mathrm{I}7\mathrm{V}, ?, \mathrm{H}16\mathrm{R}, \mathrm{M}22\mathrm{P}$

Find the missing term (?) in the following sequence :

$$\begin{gathered} \mathrm{\_} \mathrm{A} \mathrm{D} \mathrm{A} \mathrm{C} \mathrm{B} \mathrm{\_} \mathrm{\_} \mathrm{B} \mathrm{D} \mathrm{C} \mathrm{C} \\ 1 3 \mathrm{\_} \mathrm{\_} 1 2 4 2 \mathrm{\_} \mathrm{\_} \mathrm{\_} \mathrm{\_} \\ a \_ \_ b \_ \_ c d ? ? ? ? \end{gathered}$$