Choose the correct alternative for the missing term in the series: $AYD, BVF, DRH, ?, KGL$

Find out the missing term for the given series from the given alternatives:
$AB, DEF, HIJK, ?, STUVWX$

Find out the wrong term from the given series.
$1, 5, 5, 9, 7, 11, 11, 15, 12, 17$

Find the missing letters for the given series from the given alternatives:
$c....ac....aa....bc....bcc$

Find the missing letters for the given series from the given alternatives.
$ba.....ba.....bac......acb......cbac$

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

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

Which element will be fifth to the right of ninth from the right end if all the numbers are removed from the above arrangement?