mencari beda
mencari a
suku ke -11
Un = a + (n-1)b
U11 = 21 + (11-1)(-5)
U11 = 21 + 9(-5)
U11 = 21 +(-45)
U11 = -24
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mencari beda
mencari a
suku ke -11
Un = a + (n-1)b
U11 = 21 + (11-1)(-5)
U11 = 21 + 9(-5)
U11 = 21 +(-45)
U11 = -24