Which letter will fill the blank in the series C, G, K, ___, S?
Answer & explanation
Correct answer: option 4
The correct answer is Option (4) → O
Write each letter with its place in the alphabet.
C (3), G (7), K (11): each is 4 places ahead
K (11) \(+4=15\), which is O
O (15) \(+4=19\), which is S, the last letter given
So the missing letter is O.