Banyaknya suku dari barisan bilangan 6, 10 ,14, ...,66 adalah...
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Un=6+(n-1)4=66
Un=6+4n-4=66
4n=64
n=16
jadi banyaknya suku adalah 16
b = 4
Un = 66
a + (n - 1)b = 66
6 + 4(n - 1) = 66
4n - 4 = 60
4n = 64
n = 16