Question

Delhi is_ very costly place to live in article or a determiner​

Answer 1

Delhi is a very costly place to live in. ('a' is an article.)

Use of article and determiner in English grammar:

• In English grammar, 'a' and 'an' are the articles used after the nouns
• 'a' is used with something starting with consonants.
• 'an is used with a verb or object starting with vowels.
• 'A,' 'an,' and 'the' are determiners when used before the noun.