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U2=a+b
U15=a+14b
U40=a+39b
U2+U15+U40=165
a+b+a+14b+a+39b=165
3a+54b=165
U19=a+18b
3a+54b=165 (dibagi 3)
a+18b=55 → U19
Jadi, U19 barisan tersebut adalah 55.
Silakan dicek lagi.