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2015-02-28T15:24:40+08:00

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a_{1}=3
a_{6}=729
a_{6}=3r^6

Substitute
3r^6=729
Divide both sides by 3
r^6=243
6th root:
r=2.49

a2=18.6003
a3=46.50075
a4=116.251875
a5=290.6296875
a6=732

Hope this helps =)

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