Barisan geometri suku ketiga dan keenam 27 dan -1 . Suku kesepuluh...
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U6 = ar
U3 = 27
U6 -1
ar² = 27
ar^5 -1
1 = r
-27
r = - 1
3
U3 = ar²
27 = a 1
9
a = 243
U10 = ar
243 - 1[^{9} [/tex]
3
U10 = - 1
81
mohon dicek kembali untuk hasil akhirnya