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U₁₀ = a + 9b = 35, dimisalakan sebagai persamaan (2)
eliminasi persamaan (2) dan (1)
a + 9b = 35
a + 4b = 20
5b = 15
b = 3
subtitusi b = 3 kepersamaan (1)
a + 4b = 20
a + 4(3) = 20
a = 20 - 12
a = 8
S₅₀ = 50/2 ( 2(8) + 49(3))
= 25 (16 + 147)
= 25 ( 163 )
= 4075