Find if there is any grammatical error in any part of the sentence below and mark that part as your answer. If there is no error, mark 5 as your answer.
Mahatma Gandhi did not solve/ all the problems of the future/ but he did solve/ problems of his own age.
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When a sentence has a "but" or "and" connecting two similar phrases, check if they are balanced. If the first phrase is "the [Noun] of [Time/Place]," the second phrase usually needs to follow the same "the [Noun] of..." pattern.