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Suku ke berapakah 29 itu? :
(29+a) : b
(29+1) :2
30 : 2
15
Jumlah suku (Sn)
Sn = n/2 x(U1 + Un)
S15= 15/2 x (1+29)
S15= 15/2 x 30
S15= 15 x 15
S15= 225