Question : Directions: In each of the following question, which one set of letters when sequentially placed at the gaps in the given letter series shall complete it?
ab_dda_ccd_bb_d_
Option 1: ccaac
Option 2: cbaca
Option 3: cbcba
Option 4: cbbcd
Correct Answer: cbaca
Solution : Given:
ab_dda_ccd_bb_d_
To fill the series we have to divide the series – ab_d / da_c / cd_b / b_d_
Let's check the options –
First option: ccaac; abcd / dacc / cdab / badc (No repeated pattern has been found.)
Second option: cbaca; abcd / dabc / cdab / bcda (In each part, the last letter is moved to the first place followed by the first letter at the second place, the second letter at the third place, and the third letter at the fourth place.)
Third option: cbcba; abcd / dabc / cdcb / bbda (No repeated pattern has been found.)
Fourth option: cbbcd; abcd / dabc / cdbb / bcdd (No repeated pattern has been found.)
So, the series is→abcddabccdabbcda. Hence, the second option is correct.