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OpenStudy (anonymous):
what is the 12th term of a geometric sequence where a1=8 and a6=-8,192
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hartnn (hartnn):
do you know n'th term formula for geometric series ?
hartnn (hartnn):
ever seen this? \(\Large a_n = a_1 r^{n-1}\)
hartnn (hartnn):
6th term means n=6 so an =a6 = -8192 a1 = 8 is given just plug these in the formula given to find 'r' first!
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