Solution:A.K. Gopalan vs State of Madras (1950): Supreme Court ruled that Preamble is not enforceable in a court of law.Berubari Vs Union (1960): Supreme Court ruled that Preamble is not a part of the Indian Constitution however, it helps in interpretation of the clauses of the Constitution.
Keshavananda Bharti vs State of Kerala (1973)โ Supreme Court ruled that the Preamble is a part of the Indian Constitution.
The combined effect of the 3 judgments has been that even though the Preamble is a part of the Constitution, but it is not enforceable in a court of law. However, the Preamble helps in ascertaining the vision of the Constitution and hence, independently, it is non-justiciable.