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Verified answer
Mapel : MatematikaBab : Barisan dan Deret
Deret Aritmatika
a = 1
b = 3 - 1 = 2
Sn = n/2 (2a + (n-1) b )
S15 = 15/2 ( 2.1 + (15-1) 2 )
S15 = 7,5 ( 2 + 28 )
S15 = 7,5 x 30
S15 = 225