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Barisan dan DeretNo.4
Un = 3n^2 - n
U5 = 3 x 5^2 - 5
U5 = 3 x 25 - 5
U5 = 75 - 5
U5 = 70
U10 = 3 x 10^2 - 10
U10 = 3 x 100 - 10
U10 = 300 - 10
U10 = 290
U5 + U10 = 70 + 290
= 360 (A).
No.5
b = U2 - U1
b = 6 - 2
b = 4
Un = U1 + (n - 1) b
Un = 2 + (n - 1) 4
Un = 2 + 4n - 4
Un = 4n - 2 (A).
*semoga membantu. sukses selalu ^_^