Medium
Find the missing letter in the series: A, C, F, J, O, ?
Explanation
Explanation
Step 1: Convert letters to positions: A = 1, C = 3, F = 6, J = 10, O = 15.
Step 2: Differences: 3 − 1 = 2, 6 − 3 = 3, 10 − 6 = 4, 15 − 10 = 5. The jump increases by 1 each time.
Step 3: The next jump is 6, so the next position = 15 + 6 = 21.
Step 4: Position 21 is the letter U.
Answer: U.
PRO TIP
Re-check your working by substituting the answer back into the original question.