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beda= b = 10 - 13 = -3
Un = a + (n-1) b = 13 + (n-1) -3 = 13 - 3n + 3 = 16 - 3n
suku ke- n = 16 - 3n
b = -3
ditanya : suku ke n
jawab :
mencari suku ke n adalah
Un = a + ( n – 1 ) b
= 13 + ( n – 1 ) (-3)
= 13 - 3n + 3
= 16 - 3n