Find the missing group of alphabets in the following series.
ZA, WB, (…), KG, BK
$$ZA=26+1=27.$$
$$WB=23+2=25.$$
$$RD=18+4=22.$$
$$KG=11+7=18.$$
$$BK=2+11=13.$$
So, it's a sequence of difference of 2,3,4 and 5.
D is correct choice.
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