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U6 = ar^5 = 168
U6/U3 = ar^5/ar^2
r^3 = 168/21
r^3 = 8
r = 2
U3 = 21
ar^2 = 21
a (2)^2 = 21
a (4) = 21
a = 21/4
U8 = ar^7
= 21/4 (2)^7
= 672 (A)
= 21
= 21
U6 = 168
= 168
= 168
x = 168
21 x = 168
= 8
r = ∛8 = 2
= 21
a x 2² = 21
a = 21 / 4 = 5,25
U8 = = 5,25 x = 672