Letter Series Reasoning

The question asks to find the next letter in the alphabetical series: R, O, L, I, F, ?

Identifying the Pattern

To solve this letter series, we need to identify the pattern between consecutive letters. We can do this by looking at their positions in the English alphabet:

• R is the 18^th letter.
• O is the 15^th letter.
• L is the 12^th letter.
• I is the 9^th letter.
• F is the 6^th letter.

Calculating the Difference

Let's find the difference between the positions of consecutive letters:

• Position of O - Position of R = $15 - 18 = -3$
• Position of L - Position of O = $12 - 15 = -3$
• Position of I - Position of L = $9 - 12 = -3$
• Position of F - Position of I = $6 - 9 = -3$

The pattern is that each letter's position in the alphabet is 3 less than the previous letter's position.

Determining the Missing Letter

To find the letter that replaces the question mark (?), we apply the same pattern to the last letter, F:

• Position of ? = Position of F - 3
• Position of ? = $6 - 3 = 3$

The 3^rd letter in the English alphabet is C.

Therefore, the letter C will replace the question mark in the given series.