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U₆ = 480
U₂, U₃, U₄ dan U₅ ===> adalah 4 bilangan yang disisipkan
U₆ = 480 = ar⁵
U₁ = 15 = a
---------------- : (dibagi)
32 = r⁵
2⁵ = r⁵ ===> r = 2
(1 - rⁿ)
Sn = a x -----------
1 - r
(1 - 2⁶)
= 15 x -------------
1 - 2
(-63)
= 15 x --------
(-1)
= 15 x 63
= 945
semoga jelas dan membantu ya