Sumali sa IDNStudy.com at makakuha ng mga sagot ng eksperto. Magtanong at makakuha ng detalyadong sagot mula sa aming komunidad ng mga eksperto na may kaalaman.

in amedical trial, there are 54 patients. twenty-eight receive treatment B, 31 receive treatment A, and 11 receive both treatments. how many patients did not undergo any of the treatments?