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*lanjutan
Sn = n/2 (2a + (n - 1)b)
S9 = 9/2 [(2×16)+(8)(1/2)]
= 9/2 (32+4)
= 9/2 (36)
= 9(18) = 162
s9 = 9/2 (16+20)
s9 = 9x18
s9 = 162