In which form of public sector enterprise, private individuals can also become shareholders and at least 51% of the capital is contributed by the state or the central government?

Dear student,
The form of public sector in which the private individuals can become shareholders is 'government company'.  Government company means any company in which not less than fifty-one per cent of the [paid-up share capital] is held by the Central Government, or by any State Government or Governments, or partly by the Central Government and partly by one or more State Governments.

Regards