The sum of consecutive powers of 9 is a triangular number

Here's a visual proof that [math]\sum_{k=0}^n 9^k[/math] is a triangular number for each value of [math]n \in \mathbb{N}[/math].
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timteachesmath —

 
资源类型
活动
标签
exploration  proof  sequences-and-series  summation  visual 
目标群组(年龄)
15 – 18
语言
English (United States)
 
 

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