QAR, RAS, SAT, TAU, _____

SCD, TEF, UGH, ____, WKL

In a code language, if GREAT is written as 718222620 and MONK is written as 13121411, then how will VIGOROUS be written in the same language?

The next term of the following letter series will be : CAE, HFJ, MKO, RPT, ….

Which letter should replace A, D, G, J, M, ?

QPO, NML, KJI, _____, EDC