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y = 8 + 13 = 21
2.Un = (2n+4)(n-1)
U₃ = (2(3) + 4)((3)-1)
= (6+4)(2)
= 10 . 2
= 20
y=x+13
=8+13=21
(2.3+4)(3-1)
(6+4).2
10.2=20