A rope is 99 meters long, use half of it, then use the remaining 1 / 3, and then use the remaining 1 / 4. And so on, until the remaining 1 / 99 is used, how many meters are left in the end?

99×（1－1/2）×（1－1/3）×（1－1/4）×…… ×（1－1/99）
＝99×1/2×2/3×3/4×…… ×98/99
＝99×1/99
= 1 (m)

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