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Verified answer
Dik: U1 = a = 64r = U2/U1 = -32/64 = -1/2
n = 8
dit :U8........?
Un = ar^n-1
U8 = 64.-1/2^8-1
U8 = 64.-1/2^7
U8 = 64.-1/128
U8 =-64/128
U8 = -1/2
jawabannya d. -1/2