Select the combination of letters that when sequentially placed in the gaps of the given letter series will complete the series.
U _ D _ U P _ M _ P D M U _ D M
1
UMDUD
2
MPUDU
3
PMUPD
4
PMDUP
Select the combination of letters that when sequentially placed in the gaps of the given letter series will complete the series.
U _ D _ U P _ M _ P D M U _ D M