Read each sentence to find out whether there is any grammatical error in it.
The error, if any, will be in one part of the sentence. The number of that part is the answer. If there is no error, the answer is e:. (Ignore errors of punctuation, if any)
I asked the salesman (1) / if I could exchange (2)/ the faulty camera (3)/ with another one (4)/ No error (5)
"Another" is an indefinite determiner which is used to refer to an additional person or thing. So the use of "one" after "another" is redundant and has to be removed.
Thus the correct sentence is "I asked the salesman if I could exchange the faulty camera with another."
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