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u8 = 22
Dit : u20?
jawab :
Un = a+(n-1)x b
u5 = a+(5-1) x b
13 = a+4b
u8 = a+(8-1)x b
22 = a+7b
22 = a+7b
13 = a+4b
--------- - (eliminasi)
9 = 3b
b = 9:3
b = 3
13 = a+4b
13 = a+ 4.3
13 = a+12
a = 1
u20 = a+(n-1)x b
u20 = 1+(20-1) 3
u20 = 1+57
u20 = 58