Which of the following letter-clusters will replace the question mark (?) in the given series to make it logically complete?
IDX 1 MGS −6 ? UMI −26 YPD −39
1
PLW −13
2
QJN −15
3
WPS −11
4
PWX −9
Which of the following letter-clusters will replace the question mark (?) in the given series to make it logically complete?
IDX 1 MGS −6 ? UMI −26 YPD −39