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Verified answer
Kelas 8 MatematikaBab Barisan dan Deret Bilangan
b = (U8 - U3)/(8 - 3)
b = (26 - 11)/5
b = 15/5
b = 3
a = U3 - 2b
a = 11 - 2 . 3
a = 11 - 6
a = 5
Sn = n/2 . (2a + (n - 1) . b)
S5 = 5/2 . (2 . 5 + 4 . 3)
S5 = 5/2 . (10 + 12)
S5 = 5/2 . 22
S5 = 55