N56
The answer is N56 The letters of the alphabet follow the sequence Z, X, V, T,R, p and next is N The numbers follow the sequence: 2 + 4 = 6,, 6 +6 = 12, 12 + 8 = 20, 20 +10 = 30 , 30 + 12 = 42 , then 42 +14 = 56