Find the missing (?) in the series.

 

TUS, QRP, ?, KLJ, HIJ

 

How many independent words can 'STAINLESS' be divided into without changing the order of the letters and using each letter only once ?

How many letters are there in the word 'CREATIVE' which have as many letters between them in the word as in the alphabet ? 

If the first and second letters in the word DEPRESSION' were interchanged, also the third and the fourth letters, the fifth and the sixth letters and so on, which of the following would be the seventh letter from the right ?

How many independent words can 'DETERMINATION' be divided into without changing the order of the letters and using each letter only once ?  

How many pairs of letters are there in the word 'SEQUENTIAL' which have as many letters between them as are in the alphabet ? 

From the word 'BEHIND', how many independent words can be made without changing the order of the letters and using each letter only once ?  

If the positions of the fifth and twelfth letters of the word 'GLORIFICATIONS' are interchanged; and likewise the position of the fourth and fourteenth letters, the third and tenth letters, the second and eleventh letters and the first and thirteenth letters are interchanged, which of the following will be twelfth letter from the right end ?

If the last four letters of the word 'CONCENTRATION' are written in reverse order followed by next two in the reverse order and next three in the reverse order and then followed by the first four in the reverse order, counting from the end, which letter would be eighth in the new arrangement ?