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U6
= 18 dan U10
= 30. jumlah 16 suku
pertama dari
barisan
tersebut?
U10 = a + 9b
= 30
U6 = a + 5b
= 18
...............................
--
4b = 12
b = 3
a+5b = 18
a+5(3) = 18
a= 18-15 =3 S16 = 16/2
(2a +15b)
= 8 (2.3 +
15.3)
= 8 ( 6 +
45 ) = 8 ( 51 )
S16 = 408