A series is given with one term missing. Choose the correct alternative from the given ones that will complete the series.
Constable, Head constable, ?, Inspector

In each of the letter series, find the missing letters.

a – c c a b c – a b – c – b c c 

Which is the next term in the following sequence of letter clusters?
PLaN, OJbP, NHcR, MFdT, LDeV,

Choose the correct alternative from the given ones that will complete the given sequence.
LXF, MTJ, NPN, OLR, ?

Which of the following letter-clusters will replace the question mark (?) in the given series?
 PK, GT, XC, OL, ?

Choose the correct alternative from the given ones that will complete the given sequence.
ALN, DNP, GPR, ?

If it is possible to make a meaningful word of English together with the first, fifth and eighth letters of the word APTITUDES, how many total words can be made of this type? 

Select the combination ofletters that when sequentially placed in the blanks of the given series will complete the series.
 dq_pln_qt_lnd_tpl_dq_p_n