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Sum of the first odd numbers
Author:
Vincent Pantaloni
Topic:
Addition
,
Numbers
,
Sequences and Series
GIF
What is this ?
This is an original visual proof that :
The sum of the 1st n odd numbers is equal to n².
1+3+5+...+(2n-1)=n².
ggb applet
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Reboot of an older (bigger) version :
https://www.geogebra.org/m/mt8apr5e
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