In the following questions a letter-series is given, in which some letters are missing. The missing letters are given in the proper sequence as one of the alternatives. Choose the correct alternatives. _ nmmn _ mmnn _ mnnm _
Correct Answer: nnmm
Explanation:
The series is nnmm/nnmn/nnmm/nnmm.
The pattern 'nnmm' is repeated.
