Diketahui rumus suku ke n, Un= 2n+1. tentukan 7 suku pertama dari barisan tersebut
Rumus suku ke n = Un = 2n+1
U1 = 2n+1
= 2(1) + 1
= 2 + 1 = 3
U2 = 2n+1
= 2(2) + 1
= 4 + 1 = 5
U3 = 2n+1
= 2(3) + 1
= 6 + 1 = 7
U4 = 2n+1
= 2(4) + 1
= 8 + 1= 9
U5 = 2n+1
= 2(5) + 1
= 10 + 1= 11
U6 = 2n+1
= 2(6) + 1
= 12 + 1 = 13
U7 = 2n+1
= 2 (7) + 1
= 14 + 1= 15