RATIONALE: Drugs used in chemotherapy use different ways to stop tumor cells from dividing so they stop growing or die. Combining more than one drug and giving drugs in different ways may kill more tumor cells. It is not yet known whether intravenous two-drug combination chemotherapy is more effective than intravenous and intraperitoneal infusions of three-drug combination chemotherapy for treating primary peritoneal or stage III epithelial ovarian cancer.