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OpenStudy (anonymous):
Evaluate the summation of 2 times negative 2 to the n minus 1 power, from n equals 1 to 7.. PLEASE PLEASE PLEASE HELPPPPPP :((( I HAVE ABSOLUTELY NO IDEA HOW TO SOLVE THIS :(
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OpenStudy (anonymous):
\[\sum_{n=1}^{7} 2(-2)^{n-2}\]
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