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b. U1 = 1
U2 = 3
U3 = 5
U4 = 7
U5 = 9
U6 = 11
U7 = 13
U8 = 15
Jika membantu beri bintang
b = 3-1 = 2
Un = a +(n-1)b
Un = 1 +(n-1)2
Un = 1 + 2n - 2
Un = 2n - 1
nomor a
15 = 2n - 1
15 + 1 = 2n -1+1
16 = 2n
n = 16/2
n = 8
nomor b
1 = U1
3 = U2
5 = U3
7 = U4
9 = U5
11 = U6
13 = U7
15 = U8