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suku-10= a+b(n-1)
4+5(10-1)
= 49
suku ke-n = a+b(n-1)
104= 4+5(n-1)
104= 4+5n-5
104=5n-1
105=5n
21=n
U10 = 10/2 (2.4 + (10-1) 5)
U10 = 5 (8 + (9) 5)
U10 = 5 (8 + 45)
U10 = 5 x 53
U10 = 265.