Question

Do you have _ one rupee coin? write article ​

Answer 1

Answer:

Do you have a one rupee coin

Answer 2

Answer:

In such sentences “one rupee” is used as an adjective and the usage of 'a', here, is correct because the sound of “one” begins with a 'w' phonetically and we don't use 'an' before the consonant sounds. So, we do not use 'an' in front 'a', 'e', 'i', 'o' and 'u' rather we use it in front of the sounds of these vowels