In the given letter series, some letters are missing. Select the correct alternative from the options provided to complete the series in a logical and consistent order.
ab _ cb _ bn _ b _ _ n _ b
Show answer & explanation
Correct answer: A
Explanation
The total number of characters in the series (including blanks) is 15.
Dividing the series into 3 groups of 5 letters each:
ab _ cb / _ bn _ b / _ _ n _ b
By testing Option (A) nacabc, the pattern formed is:
abncb / abncb / abncb
The group abncb repeats continuously.
Therefore, the missing letters are nacabc.