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The second term of a GP is 4, the fifth term is 81, find the seventh term

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given:
ar = 4
ar^4 = 81
divide the 2nd by the first:
r^3 = 81/4
r = (81/4)^(1/3) = appr 2.7257
????

are you sure it didn't say , the fourth term is 81 ???
It would work out so nicely!

/(op0/

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