What letter should appear next in this sequence? D, W, H, S, L, ?

Answer 1

If we assign A to 1, B to 2 ....... & Z to 26 then
D(4) & W(26-(4-1)) (23)
H(8) & S(26-(8-1)) (19)
L(12) & O(26-(12-1)) (15).
So O is the next alphabet in the series.

Answer 2

Answer: O, P,..
If we assign A to 1, B to 2 ....... & Z to 26 then
D, W, H, S, L, ? = 4,23,8,19,12,...
=> 4 ,8, 12, 16... (Subtract 4) ,and 23, 19, 15, 11,.....(Add 4)
so, the series is D, W, H, S, L, O,P,... => 4,23,8,19,12,15,16