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U₅ = 5 + 4 = 9
b.) Un = 4n - 3
U₅ = 4x5 -3
= 20 - 3 = 17
c.) Un = 1/2n (n + 2)
U₅ = 1/2 x 5 ( 5+2)
= 2,5 x 7 = 17,5
d.) Un = n² +1
U₅ = 5² +1
= 25 + 1 = 26
e.) Un = 5 x 2n
U₅ = 5 x 2 x 5
= 50