which one is correct 4?

neo7friend:

To my knowledge,
I have some experiences in working in an office--wrong: because no "s" for experience

I have experiences in working in an office--Wrong again:because no "s" for experience


I have some experience in working in an office-- Correct

I have experience in working in an office -- Correct

One more sentence for your reference:
I have working experience in an office.

Hi, for me, I will select "I have experiences in working in an office" comparing with the others, u know, experience(s) is already meaning more than one, so if use (some) that I think it will be duplicated in the sentence. normally, I said to people " I have working experiences in the office" - more than 1 year. Hope it help!!