Question

where did you buy ambrella​

Answer 1

Explanation:

Yes, the is the correct article, because the umbrella has already been bought. Therefore, it's assumed we are talking about a particular umbrella – namely, the umbrella you bought and now own.

Interestingly enough, if you didn't have an umbrella, and you were asking me where you could buy one, the article would be different:

Where can I buy an umbrella?

But if I'm asking you where you got your umbrella, I use a definite article:

Where did you buy the umbrella?

or I could use a determiner:

Where did you buy that umbrella?

Answer 2

question luck samajh me nahi aa raha hai.???