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U10 = 47
S12 = ...?
>> menentukan a dan b nya
b = 47-27 : 10-6 = 20 : 4
= 5
a = U6 = 27
= a + 5b = 27
= a + 5.5 = 27
= a + 25 = 27
a = 27 - 25 = 2
>> S12 = n/2 (2a + (n-1) b)
= 12/2 ( 2.2 + 11.5)
= 6 ( 4 + 55 )
= 6 . 59
S12 = 354
*Semoga membantu:)