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a. S10 = 10/2 (2.4+(10-1)5)
= 5 (8+45)
= 265
b. S10 = 10/2 (2.6+(10-1)4)
= 5 (12+36)
= 240
a. a=2
b=5
n=10
Sn = 10/5 (2*2 + 9*5)
Sn = 245
untuk selanjutnya dgn jalan yg sama.
b. Sn = 330
c. Sn = 275
d.Sn = 55/2