tentukan jumlah bilangan genap 1-101
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a = 2
b = 4
Un = 100
Un = a + (n - 1)b
Un = 2 + (n - 1)2
Un = 2 + 2n - 2
Un = 2n
100 = 2n
n = 50
=
=
= 25(102) = 2550