Which letter-cluster will replace the question mark (?) to complete the given series?

HSDA, IZQT, ?, KNQF, LUDY

Which letter-cluster will replace the question mark (?) to complete the given series?
 XAPE, BIBU, ?, JYZA, NGLQ

Which of the following numbers will replace the question mark (?) in the given series?
 8, 16,13, ?, 47, 282

In the following question, select the missing number from the given series.
 129, 126, 123, 120, 117, ?

A series is given with one term missing. Select the correct alternative from the given ones that will complete the series.
 LOG, FLH, ZII, TFJ, NCK,?

Which of the following numbers will replace the question mark (?) in the given series?
 23, 28, 280, 295, 5900, ?

Which letter-cluster will replace the question mark (?) to complete the given series?
 TBNF, CJUL, LRBR, UZIX, ?

Select the letter that will replace the question mark (?) in the given letter series.
 a, d, h, n, ?