What comes next CG, EI, GK, ?

Check the pattern in each position:

First letters:
C → E → G → ?
( +2 each time )
So next is I

Second letters:
G → I → K → ?
( +2 each time )
So next is M

Thus the next pair is:

IM

C, E, G → हर बार +2 → अगला = I
G, I, K → हर बार +2 → अगला = M

अतः सही उत्तर: IM