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the first and third terms of a G.P are 5 and 80 respectively.what is the 4th term

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Your given:
a = 5
ar^2 = 80 ---> 5r^2 = 80
r^2 = 16
r = ± 4

term4 = ar^3
= 5(4)^3 OR 5(-4)^3
= 320 OR -320

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