One strand of a `DNA` has the sequence `ATGCTTCA`. What is the sequence of the bases in the complementary strand?

If one strand of a DNA has the sequence - ATCGTCCA - what is the sequence of the complementray strand ?

If one strand of DNA has the nitrogenous base sequence ATGCTTGA, the sequence in the complementary strand will be :

If one strand of the DNA has the sequence 'ATGCTTGX, then the sequence of complementary strand would be