Find the missing group in the sequence:
X7D, V11G, T13J, _____, P19P
The first alphabet in the series i.e. X,V,T follows the trend of deducting -2 from the place value of the alphabet.
The numbers are increasing in +4 and +2 sequence alternately. the second alphabets in the series i.e. D, G, J are increasing by +3.