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a+9b=30
------------ -
-4b = -12
b = 3
a+5b = 18
a+5.3 = 18
a+15 = 18
a = 18-15
a = 3
S16 = n/2 (2a+(n-1)b)
= 16/2 (2.3 + (16-1).3)
= 8 (6 + 45)
= 8.51
S16 = 408
u6 ⇒ a + 5b = 18 _
4b = 12
b = 3
subtitusi
a + 5b = 18
a +5(3) = 18
a + 15 = 18
a = 18-15
a = 3
juMlah suku
S16 =16/2 ( 3x2 + ( 16-1)3)
= 8 ( 6 + 45)
= 8 ( 51)
= 408
jawabannya adalah 408