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U3=13
U7=29
Dit:S25=?
Jwb:
dalam deret aritmatika berati a dan b pasangnnya,
a+6b=29--->dari U7
a+2b=13--->dari U3
jadikan persamaan linier 2 variabel
a+6b=29
a+2b=13-
4b =16
b=4
*cari suku pertama(a)
pakai pers.1
a+6b=29
a+6(4)=29
a+24=29
a =29-24
a=5
masukan ke rumus Sn