i
The letter "A" or "a" precedes the letter "B" or "b".
The next letter is U A -> miss a letter (B) -> C C -> miss two letters (DE) -> F F -> miss three letters (GHI) -> J J -> miss four letters (KLMN) -> O and so on....
K
S
The next letter in the sequence is S. The pattern follows the alphabet sequence with each letter moving forward two positions.
the next letter would be 'b'
Check out the link for the sequence.
f
B
i
I,V
c
CRC CBO and COL
bala
d
b