Complete the series : B, D, F, I, L, P, ?

Question

If symbols of alphabets (without any change in their sense and meaning) are
L M V A K B N C P I D Y O S E Q R F T H G J U W Z X
then
How we will write "WORLDCUP".

Answer 1

B + 2 => D + 2 => F + 3 => I + 3 => L + 4 => P + 4 ===> T

Answer 2

Answer is B, D, F, I, L, P, "T".

The letters count between B & D and D & F is "1".
Similarly between F & I and I & L is "2".
From this, we get same letter count between 2 combinations of letters in the series like {B&D , D&F} and {F&I , I&L}.
So for the next two series letter count { L&P and P&? } must be "3".
So 3 letters next to P is T.