  We discuss a comprehensive way to study the parameter degeneracies in the
form of a generalized degeneracy in the neutrino oscillation experiments. First
we describe the various degeneracies by considering only neutrino run of the
long baseline experiment (LBL), NO$ \nu $A. Then we discuss the role of
antineutrinos. Later, we present the combined role of T2K (LBL experiment) and
ICAL@INO (atmospheric experiment) to resolve these degeneracies. We also
discuss the affect of new physics like non-standards interactions (NSI) on the
determination of neutrino mass hierarchy in DUNE.
