Select the combination of letters that when sequentially placed in the gaps of the given letter series will complete the series. m_o_op_non_pm_o

nmnon nnmon nmmon nnomn

nnmon

If we break the series in this sequence then we find that: m_o / _op / _no / n_p / m_o So, the correct sequence of the letters is mno / nop / mno / nop / mno and required code for the series is nnmon