Three persons, including a woman, were arrested in Madhya Pradesh's Ujjain district for allegedly duping a 50-year-old woman of Rs 5.09 lakh by keeping her under "digital arrest" for nearly 40 hours, police said on Tuesday. The accused were identified as Rajesh Jat (25), Balram Jat (32), and Yukti Bairagi (25), all residents of Ratlam district.