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U1 = a = 6
U8 - U5 = 24
Jawab :
U8 = a + 7b
U5 = a + 4b
------ -
3b = 24
b = 8
S60 = n/2 ( 2a + 59b )
= 60/2 ( 2.6 + 59.8 )
= 30 ( 12 + 472 ) = 14520