Find the missing (?) in the series.

 

TUS, QRP, ?, KLJ, HIJ

 

The logic behind the sequence given in the question is +4, +4, +6, +6
Therefore, the sequence which follows the same logic in the given options is DHLRX.

Here the series has mixed two series.
n m l k...! reverse alphabet
o p q r ...! forward alphabet
So the letter before k is j and after that letter after r is s and so on...

Each corresponding letter moves five places forward in the alphabet.
Here as BE is related to GJ then PS will relate to UX.

Given word is TIRADES
Now the consonants T, R, D, S are replaced by S, Q, C, R
And Vowels are I, A, E are replaced by J, B and F
They are arranged alphabetically
New word is BCFJQRS

The fourth letter from the right end is J.

1ST SERIES = M J G... It decreasing by 3 alphabets.
2ND SERIES = N Q... It increasing by 3 alphabets.

M N J Q G T...

The twentieth element in the above arrangement is 'E'.
Then, the sixth element to the left of 'E' is 'L'.

'GLUE' is the only meaningful word that can be formed using the letters given.

In the given series, each letter moves seven letters forward to obtain the next.
So, XZV replaces ? in the series.