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u3 = ar² = 9
ar⁴/ar² = 81/4 / 9
r² = 9/4
r = 3/2
ar² = 9
a(3/2)² = 9
a = 4
u6 = ar⁵
= 4(3/2)⁵
= 4(243/32)
= 243/8
u5/u3 = 81/4 : 9 = 9/4
r^2 = 9/4
r = 3/2
u3 = a r^2 = 9
= a x 9/4 = 9
a = 4
u6 = 4 x( 2/3)^5 = 4x 32/243
= 128/243