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A+5b=16
A+3b=6
---------- —
2b=10
B=5
A+3b=6
A+15=6
A=-9
Suku utama =-9, beda=5
=
= 5
a = Un - ((n-1)b)
= U4 - (4-1)b
= 6 - 3x5
a = -9