Choose the correct alternative for the missing term.
$LXF, MTJ, NPN, OLR, ?$

Choose the correct alternative for the missing term.
$AB, DEF, HIJK, ?, STUVWX$

What should come next in the following letter series?
$H, G, F, E, D, C, B, A, H, G, F, E, D, C, B, H, G, F, E, D, C, H$

Fill in the blank space for the given series with the correct alternative.
$1, 4, 2, 8, 6, 24, 22, 88, (\ldots)$

These questions are based on the following letter/number/symbol arrangement. Study it carefully and answer the questions that follow.

$5, D,H,E, \star, 7,9, \$ ,F,I ,6 ,R ,\% ,L ,1 ,A,J, 3, B, \# ,4 ,@ ,K,P ,8, U,M ,2$

If all the symbols are removed from the above arrangement, which element will be third to the left of thirteenth from the left?

Fill in the blank space for the given series with the correct alternative.
In the series $3, 9, 15, . . .$ what will be the $21^{st}$ term?