A, CD, GHI, ?, UVWXYZ

here the given series is A, CD, GHI, ?, UVWXYZ

here the pattern is that 1st term is A and then a single alphabet is missed and next two alphabets are written aFter that next two alphabets are missed and next three alphabets are written and so in next case for missing term 3 next terms will be missed i.e. JKL will be missed and next 4 terms will be written i.e MNOP and hence the missing term is MNOP