Declension table of ?pradhānamantrin

Masculine	Singular	Dual	Plural
Nominative	pradhānamantrī	pradhānamantriṇau	pradhānamantriṇaḥ
Vocative	pradhānamantrin	pradhānamantriṇau	pradhānamantriṇaḥ
Accusative	pradhānamantriṇam	pradhānamantriṇau	pradhānamantriṇaḥ
Instrumental	pradhānamantriṇā	pradhānamantribhyām	pradhānamantribhiḥ
Dative	pradhānamantriṇe	pradhānamantribhyām	pradhānamantribhyaḥ
Ablative	pradhānamantriṇaḥ	pradhānamantribhyām	pradhānamantribhyaḥ
Genitive	pradhānamantriṇaḥ	pradhānamantriṇoḥ	pradhānamantriṇām
Locative	pradhānamantriṇi	pradhānamantriṇoḥ	pradhānamantriṣu

Compound pradhānamantri -

Adverb -pradhānamantri