If one strand of $$DNA$$  has the sequence $$ATGCTTGA,$$    the sequence in the complimentary strand would be

Solution :
On the basis of structure of guanine and complementary bases present in them, we can say that if the sequence of bases in one strand of $$DNA$$  is $$I,$$ then the sequence in the second strand should be $$II$$
$$\eqalign{ & A:T:G:C:T:T:G:A{\text{ }}I \cr & T:A:C:G:A:A:C:T{\text{ }}II \cr} $$