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a = -7
n = 14
A = -7
N = 14
S14 = n/2 ( 2a + ( n - 1 ) 6 )
S14 = 14/2 [ 2 ( -7 ) + ( 14 - 1 ) 4 )
S14 = 266
Jadi jumlah 14 uku pertama adalah 266
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