[" (a) "18," (b) "42," (c) "80],[" 39."(...

[" (a) "18," (b) "42," (c) "80],[" 39."(5^(n+2)-6times5^(n+1))/(13times5^(n)-2times5^(n+1))" is equal to "],[[" (a) "(5)/(3)," (b) "-(5)/(3)," (c) "(3)/(5)]]

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