Select the combination of letters that, when placed in the blanks of the given letter series in order, will complete the series.
c _ k c c f _ k k _ c c _ f _ k k k
Answer & explanation
Correct answer: option 1
The correct answer is Option (1) → ffcff
In a letter series with blanks, look for blocks that repeat or grow in a fixed way. Here the letters c, f, k appear once, then twice, then three times each.
Block 1 (each letter once): c _ k becomes c f k
Block 2 (each letter twice): c c f _ k k becomes c c f f k k
Block 3 (each letter three times): _ c c _ f _ k k k becomes c c c f f f k k k
The series is cfk ccffkk cccfffkkk, and the blanks in order are ffcff.