Any one (two words) is an adjective phrase that refers to any single member of a group (of either people or things).
क) मालसामान खरिद गर्दा क्रेता नै सजग हुनुपर्ने सिद्धान्त ः प्रत्येक उपभोक्ता आफैं सचेत हुनुपर्दछ ।