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U₆ = 30 = a + (6-1)b
U₆ = 30 = 15 + (5)b
30 = 15 + 5b
5b = 15
b = 3
jumlah umur anak pertama sampai anak ke enam = n/2 (a + U₆)
= 6/2 (15 + 30)
= 3 x 45 = 135
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