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( -25 + 7 ) : ( 10 - 4 ) = -3
Awal :
-7 = a + 3b
-7 = a - 9
a = -2
Rumus suku ke n :
Un = a + ( n - 1 ) b
Un = -2 + ( n - 1 ) ( -3 )
Un = -2 - 3n + 3
Un = 1 - 3n