Question

Diketahui barisan bilangan 2,5,8,11,14
a.tentukan Un
b.Tentukan U15
c.Suku keberapakah 308?

Answer 1

Rumus Un
bn-(b-a)
3n-(3-2)
3n-1

maka
a) Un = 3n-1
b) U15 = 3.15 -1 = 45-1 = 44
c) 3n-1 = 308
    3n = 308+1 = 309
    n = 309/3 = 103

Answer 2

a).


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b).


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c).