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a+a+(10-1)b+ a + (19-1)b
a+a+9b+a+18b = 63
3a + 27b = 63
sederhanakan(dibagi 3 semua)
a + 9b = 21
ingat, Un= a+(n-1)b
U10 = a+(10-1)b = a+9b
maka U10 = a+9b = 21
a + a + 9b + a + 18b = 63
3a + 27b = 63 [ sederhanakan ]
a + 9b = 21
U₁₀ = a + 9b
= 21