Art 14,Art. 15 and Art. 16 r related with each other.
Art. 14 gives 2 concepts eqality before law & equal protection of laws
Art. 15 gives protection against discrimination..
Art. 16 gives protection against discrimination in public employment.
Art. 14 applies to citizens as well as non citizens but Art. 16 applies only to citizens.
Art. 15 covers entire range of state activities but Art. 16 is related only to employment.