The lower corner of a leaf in a book is folded over so as to just reach the inner edge of the pa...

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The lower corner of a leaf in a book is folded over so as to just reach the inner edge of the page. The fraction of width folded over if the area of the folded part is minimum is
(a) \( \frac{5}{8} \)
(b) \( \frac{2}{3} \)
(c) \( \frac{3}{4} \)
(d) \( \frac{4}{5} \)
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