The winning $4M Mega Millions ticket was purchased at Giant Food in Colesville, Maryland. The retailer earns a $2,500 bonus for selling the ticket. The winning numbers for the March 10 drawing were 16, 21, 30, 35 and 65. The jackpot now stands at $50 million. To play in Maryland, players must be 18 years or older and can purchase tickets at any retailer.