How do you prove this expression is an integer when n is a natural number?

Did you work hard today?

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Confidence after the Gaokao math exam—let's take a break! Wishing all Gaokao students continued effo

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A 16-year-old prodigy who’s already in senior year has joined our school!

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Day 127 Check-in | Back in action again!

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Day 113 Check-in | Push-Up Preparation

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Login!! But forgot the password..

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[A Little Reunion] She's a great teacher

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Sandy's Fiery Chestnuts

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Parenting tips

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A special forces operative disguises herself as a student teacher to discipline unruly students! Aft

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Those gone hot melt adhesives are attacking again | campus handmade creative tips for hot melt adhes

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Introduction to Racing Car Tire Changes at Top Speed

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Ding ding ding, where has everyone gone?

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[Brother Yue] The Japanese movies that young people should watch the most. Watch it before the colle

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"Mathematics, the laws God must follow."

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Why is the conic a god?

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