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u13=> a + 12b = 73 _
-4b = 20
b = 20/-4
b = -5
subtitusikan
a + 8b = 93
a +8(-5)=93
a - 40 = 93
a = 93 + 40
a = 133
hasil dari jumalh 24 suku
S24 = n/2 (2a + (n-1)b)
= 24/2 ( 2 x 133 + ( 24-1)-5)
= 12 ( 266 - 155)
= 12 ( 111)
= 1332
Dit: Sn ?
Jwb: B: 93-73= 20 = 5 a5(8)=93
13-9 = 4 a+40=93 -> 53
Sn= n/2(2a+(n-1)xb
= 24/2(2.53+23x5)
= 12x(106+115)
= 12x221
=2652