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( 33 - 23 ) : ( 7 - 5 ) = 5
Awal :
a + 4b = 23
a + 20 = 23
a = 3
U₂₀ = 3 + ( 20 - 1 ) 5
U₂₀ = 3 + 95
U₂₀ = 98
33-23 = 10/2 = 5
7-5
cari suku awal (a)
U5 = a+(5-1)b = a+4b
23 = a+ ( 4 x 5)
23 = a + 20
a = 23-20 = 3
Un = a+(n-1)b
U20 = 3 + (20-1)5
U20 = 3 + ( 19 x 5)
U20 = 3 + 95
U20 = 98