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U1 + r.U1 = 20
U1(r + 1) = 20
U3 + U4 = 320
U1.r² + U1.r³ = 320
U1.r²(r + 1) = 320
U1.r²(r + 1) = (U1(r + 1)).r²
320 = 20r²
r² = 16
r = 4
U1 + U1.r = 20
U1 + 4U1 = 20
5U1 = 20
U1 = 4
U3 = U1.r²
U3 = 4.4²
U3 = 4.16
U3 = 64
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