Arrange the parts to form a meaningful sentence: P: directive principles of state policy which though not justiciable are / Q: fundamental to the governance of the country and it is the duty / R: the Constitution lays down certain / S: of the state to apply these principles in making laws

The complete sentence reads: 'The Constitution lays down certain (R) directive principles of state policy which though not justiciable are (P) fundamental to the governance of the country and it is the duty (Q) of the state to apply these principles in making laws (S).' Starting with R provides the subject and verb 'lays down certain', followed by P describing what is laid down (directive principles), then Q completing the description, and S providing the final clause. Hence, the correct sequence is RPQS.