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Sn= n/2 (2a+(n-1)b)
Sn= 5/2 (2(4)+(5-1)5)
Sn= 5/2 (8+20)
Sn= 5/2 (28)
Sn= 70 <------- jawaban
b) a= 18 b=-3
Sn= n/2 (2a+(n-1)b)
Sn= 5/2 (2(18)+(5-1)-3)
Sn= 5/2 (36-12)
Sn= 5/2 (24)
Sn= 60 <------ jawaban