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2,5 (16+28)
2,5 x 44
110
cari beda = 15-8 = 7/2 = 3,5
4-2
U2 = a+b
8 = a + 3,5
a=8-3,5
a=4,5
maka a=4,5 dan b=3,5
Sn=n/2 (2a+(n-1)b)
S5=5/2 (2 x 4,5 + (5-1)3,5)
S5=5/2 (9 + (4 x 3,5)
S5=5/2 (9+14)
S5=5/2(23)
S5=57,5