suku pertama a = 28
beda b = 23 - 28 = - 5
Rumus suku ke-n
Un = a + (n-1)b = 28 +(n-1)(-5) = 28 -5n + 5 = 33 -5n
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suku pertama a = 28
beda b = 23 - 28 = - 5
Rumus suku ke-n
Un = a + (n-1)b = 28 +(n-1)(-5) = 28 -5n + 5 = 33 -5n