I can't do the fourth question (singular) but I have done all the others. I can't do the fourth and fifth questions (plural) but I have done all the others. Nakool Here it should be 'all the other questions' in place of 'all the others'.
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NakoolHere it should be 'all the other questions' in place of 'all the others'.You can make the substitution, but it is not necessary. The two above are perfectly fine.