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S20 = 670
20/2 (2.5 + 19b) = 670
10 (10 + 19b) = 670
100 + 190b = 670
190b = 570
b = 3.
U12 = a + (n-1)b
= 5 + (12-1)3
= 5 + (11)3
= 5 + 33
= 38
Jadi suku ke 12 nya adalah 38.
Semoga membantu yaaa;)
a = 5
S20 = 670
670 = 20/2(2(5) + (20-1)b)
670 = 10 ( 10 + 19b)
670 = 100 + 190b
100 + 190b = 670
190b = 670 - 100
190b = 570
b = 3
U12 = a + 11b
= 5 + 11(3)
= 5 + 33
= 38
maaf kalau salah