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Helppppp.. picture attached

Helppppp.. picture attached
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Helppppp.. picture attached

Helppppp.. picture attached-example-1
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User Edd Turtle
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1 Answer

4 votes

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
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User Ouma
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