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suku tengah =
Sehingga dan
a. U₁₆ = a + 15b = 1
U₃₁ = a + 30b = 31
-------------------- -
-15 b = -30
b = 2
a + 15(2) = 1
a = 1-30
= -29
b. S₃₁ = n (a+U₃₁)
= . 31 (-29 + 31)
= 31
10. S≈ = -85 = -
S≈ =
- =
1-r =
=
r = 1-
=
=
silahkan di re check process nya sebelum menjadi jawaban akhir
semoga membantu