Answer: Patiala, Nabha, Jind, Kapurthala
Notes: PEPSU (Patiala and East Punjab States Union) was formed in 1948 from Patiala, Nabha, Jind, Kapurthala, Faridkot, Malerkotla, Kalsia, and Nalagarh, uniting eight princely states after independence as a Part-B state in Indian union.
