Z S G M D I F E H ?

Which letter replaces the question mark ?

Z S G M D I F E H ?

Know the answer with full explanation

Answer is G

Now the question is how? Its very simple

Z is 26th letter So Z=26 ,

S =19 G =7 So 19+7 = 26 ,

M=13 D=4 I=9 So 13+4+9 = 26 ,

F=6 E=5 H=8 ?=7 So 6 + 5 + 8 + 7 =26

So G=7