Select the combination of letters that, when placed in the blanks of the given letter series in order, will complete the series.
_ R E _ K E R T _ E K _ E R _ R E _ K E R
Answer & explanation
Correct answer: option 3
The correct answer is Option (3) → TKRKTK
In a letter series with blanks, look for a block of letters that repeats; the blanks are then the letters the block needs at those places. The 21 places split into three blocks of seven, each T R E K K E R, the word trekker.
Block 1: _ R E _ K E R needs T, K
Block 2: T _ E K _ E R needs R, K
Block 3: _ R E _ K E R needs T, K
The series is TREKKER TREKKER TREKKER, and the blanks in order are TKRKTK.