Which set of letters, when placed in order in the blanks of the given letter series, completes it?
_ T R R T _ R R R T _ T R R R R _ T T T
Answer & explanation
Correct answer: option 4
The correct answer is Option (4) → RTTT
The given letters show groups of R’s followed by T’s, one R and one T more in each new group: RT, RRTT, RRRTTT, RRRRTTTT.
Group 1: RT, so the blank here is R
Group 2: RRTT, so the blank here is T
Group 3: RRRTTT, so the blank here is T
Group 4: RRRRTTTT, so the blank here is T
The blanks, in order, are therefore R, T, T, T.