How many uniform identical textbooks with a width of \( 25 \mathrm{...

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How many uniform identical textbooks with a width of \( 25 \mathrm{~cm} \) can be stacked on top of each other on a level surface without the stack falling over, if each successive book is displaced \( 3 \mathrm{~cm} \) in the width direction relative to the - next lower book?
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