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U₄ = 5 + 2 = 7
a = 1 b = 2 U₄ = 7
barisan penyebut : 2, 4, 6 ⇒ b = 2
U₄ = 6 + 2 = 8
a = 2 b = 2 U₄ = 8
kalau soalnya seperti ini baru jawabnya :
S1 = 1/2
S2 =
S3 =
S4 =
yg disoalnya
S1 = 1/2
S2 = 1/2 + 3/4 = 2/4 + 3/4 = 5/4
S3 = 5/4 + 5/6 = 15/12 + 10/12 = 25/12
S4 = 25/12 + 7/8 = 50/24 + 21/24 = 71/24
terpaksa memakai cara manual