Additional Sessions Judge D N Mishra awarded death sentence to Neha Verma (25), Manoj Aayed (32) and Rahul Choudhary alias Govinda (22).
Terming the crime as "rarest of the rare", the judge in his 44-page judgment said: "For the greed of some rupees, three hapless women of a family were killed in a very cruel manner....The culprits deserve no mercy."
The judge noted that the victims were shot, and stab wounds covered their entire bodies.
According to police, Neha, who wanted to become rich quickly, was the mastermind of the crime.
After looting jewellery, camera, mobile phone, ATM cards and other articles valued at around Rs 1.5 lakh from the victims, the accused murdered them brutally, the prosecution said.