Select the letter that can replace the question mark (?) in the following series. C, F, I, L, O, R, ?
Identifying Alphabetical Series Pattern
The question presents an alphabetical series: C, F, I, L, O, R, ? We need to find the pattern governing this sequence.
Analyzing Letter Positions
Let's determine the position of each letter in the English alphabet:
- C is the 3rd letter.
- F is the 6th letter.
- I is the 9th letter.
- L is the 12th letter.
- O is the 15th letter.
- R is the 18th letter.
Determining the Series Progression
Observe the difference between the positions of consecutive letters:
- Position difference between F and C: $6 - 3 = 3$
- Position difference between I and F: $9 - 6 = 3$
- Position difference between L and I: $12 - 9 = 3$
- Position difference between O and L: $15 - 12 = 3$
- Position difference between R and O: $18 - 15 = 3$
The pattern shows a consistent increase of 3 positions for each subsequent letter in the series.
Calculating the Missing Letter
The last letter given is R, which is the 18th letter. Following the established pattern, the next letter's position will be:
$18 + 3 = 21$
The 21st letter of the English alphabet is U.
Conclusion
Therefore, the letter that replaces the question mark (?) in the series is U.
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