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2 = ar²
a = 2/r²
U6 = a.r^5
1/4 = a . r^5
1/4 = 2/r² . r^5
1/4 = 2 . r³
1/4 . 1/2 = r3
1/8 = r3
r = ∛1/8
r = 1/2
a = 2/r²
a = 2 / (1/2)²
a = 2 / 1/4
a = 8
U8 = a .r^7
U8 = 8 . (1/2)^7
= 8 . 1/128
= 8/128
U8 = 1/16