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deret berupa deret geometri
U8: 7×3^7= 15309
U15: 7×3^14= 33480783
semoga membantu. semangat
a=7
r=3
U₈=a.r⁷=7.(3)⁷=7.2187=15309
U₁₅=a.r¹⁴=7.(3)¹⁴=7.4782969=33480783
semoga bisa membantu. :)