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Verified answer
Gunakan rumus mencari suku deret geometriBarisan Geometri: -3, -15, -75
a = -3
r = -15 ÷ -3 = 5
dit: U₁₀
jawab:
Un = arⁿ⁻¹
U₁₀ = ar¹⁰⁻¹
= ar⁹
= -3 × 5⁹
= -3 × 1.953.125
= -5.859.375.