saabrrinnaaa
saabrrinnaaa
07-06-2018
Mathematics
contestada
helppppp.. picture attached
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gmany
gmany
07-06-2018
[tex]n^2+n\\\\check:\\\\a_1=1^2+1=2\\a_2=2^2+2=6\\a_3=3^2+3=12\\a_4=4^2+4=20[/tex]
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