The next triplet of alphabet in the following series ABD DGK HMS MTB SBL is:
2) ZKW
In this series, we can see that there was a numerical progression in the placement of the alphabets. The numerical progression can be seen in the following format:
A +3 D +4 H +5 M +6 S +7 Z
B +5 G +6 M +7 T +8 B +9 K
D +7 K +8 S +9 B +10 L + 11 W
So we can see that the addition of the given number of alphabets to the letters we see above will generate the next alphabets.
There is a plus 1 addition that is seen in all the letters mentioned and the one that naturally follows the series is option 2 which is ZKW.
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