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Find a1 for the geometric series r=-1 and s11=7

Find a1 for the geometric series r=-1 and s11=7
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Find a1 for the geometric series r=-1 and s11=7

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User Ral Zarek
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s11 = a(1-r^n)/(1-r)
7 = a (1- (-1)^11) / [(1-(-1)]
7 = a( 2)/2
a=7
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User Izaya
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