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Dik. barisan : 2, 5, 8, 11, ... 3n-1 & Sn = 155Dit. nilai n?
Jawab...
beda (b) = u2 - u1 = 5-2 = 3
Sn = n/2 (2a + (n-1) b)
155 = n/2 (2(2) + (n-1) 3)
155 = n/2 (4 + 3n -3)
155 = n/2 (3n + 1)
n = 10
Semoga membantu.. ^_^