A 23-year-old Atlantic City man Majid Harris admitted robbing two delivery drivers four days apart and assaulting an inmate at the Atlantic County jail after his arrest, the Atlantic County Prosecutor’s Office said Thursday. Harris pleaded guilty Wednesday to armed robbery, possession of a handgun for an unlawful purpose and aggravated assault.Under the terms of his plea agreement, Harris is expected to be sentenced to 12 years in prison, and would have to serve at least 10 years before he could be considered for parole. Sentencing is in March.