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Bab Barisan dan DeretMatematika SMP Kelas VIII
Geometri
U6 = a x r⁵
= 2 x (-3)⁵
= 2 x (-243)
= -486
Sn = (a x (rⁿ - 1)) / (r - 1)
S6 = (2 x ((-3)⁶ - 1) / (-3 - 1)
= (2 x (728)) / -4
= -364
S6 - U6 = -364 - (-486)
= -364 + 486
= 122
jawabannya C