Which group of letters will complete the given letter series by sequentially placing the blank space?
M_OMMN_M_NOMMN_M

In this question, a sequence is given, with one term missing. Choose the correct alternative from the given ones that will complete the series.
NOA , PQB , RSC ?

7, 18, 40…….?....117, 172

27,32,30,35, 33, ?

18, 25, 23, 30, ?

2, 65, 7, 59, 12, 53, ?, ?

3, 4, 7, 11, 18, 29, ?

3, 18, 48, 93……….?............