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Deret aritmatika diketahui U6 10 dan U25 67 Tentukan jumlah 6 suku yang pertama

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Penjelasan dengan langkah-langkah:

U6= 10

a+5b= 10

U25= 67

a+ 24b= 67

a+5b= 10

a+24b= 67

________-

19b= 57

b= 3

a= -5

S6 = 6/2 (2a+5b) = 3 (2(-5)+5(3)) = 3. 5 = 15

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