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

HFK, KHM, ?, QLQ, TNS

Which of the following numbers will replace the question mark (?) in the given series?

97, 131, 165, 199, 233, ?

There are five persons A, B, C, D, E standing on six steps numbered 1, 2, 3, 4, 5 and 6 from the bottom. At most one person is standing on each step. The step number, on which A is standing, is two less than that of C. Step number on which B is standing is one more than that of D. 

If A is standing on Step 1 and B is not standing on Step 6, which of the following is true? 

Select the option that is related to the third word in the same way as the second word is related to the first word. (The words must be considered as meaningful English words and must not be related to each other based on the number of letters/number of consonants/vowels in the word.)
 Ant: Antling:: Deer:?

Select the set in which the numbers are related in the same way as are the numbers of the following sets. (NOTE: Operations should be performed on the whole numbers, without breaking down the numbers into its constituent digits. E. g. 13 – Operations on 13 such as adding / subtracting / multiplying etc. to 13 can be performed. Breaking down 13 into 1 and 3 and then performing mathematical operations on 1 and 3 is not allowed)

(5, 41, 4)
(2, 68, 8)

Select the number from among the given options that can replace the question mark (?) in the following series. 

Question figure.

Select the most appropriate indirect form of the given sentence.

“Press button A to start the machine,” said the instructor to the trainees.

Study the given pattern carefully and select the number that can replace the question mark (?) in it.
 First row - 15, 11, 43
 Second row - 13, 8, 48
 Third row - 9, 7, ?
 (NOTE: Operations should be performed on the whole numbers, without breaking down the numbers into its constituent digits. E.g. 13 – Operations on 13 such as adding / subtracting / multiplying etc. to 13 can be performed. Breaking down 13 into 1 and 3 and then performing mathematical operations on 1 and 3 is NOT allowed)