Tuliskan lima suku pertama barisan Un=3n-1​

Un = 3n – 1

U1 = 3 x 1 – 1 = 2

U2 = 3 x 2 – 1 = 5

U3 = 3 x 3 – 1 = 8

U4 = 3 x 4 – 1 = 11

U5 = 3 x 5 – 1 = 14