tuliskan 5 suku pertama dari barisan yang suku ke n nya dinyatakan dengan rumus a.2n+1 b.n^2 +1 c.n^2+n d.5×2^n-1

a. U1 = 2.1+ 1 = 3
U2= 2.2+ 1= 5
U3 = 2.3 + 1= 7
U4 = 2.4 + 1 = 9
U5 = 2.5 +1 = 11

b. U1 = 1^2+1 = 2
U2 = 2^2 + 1 = 5
U3 = 3^2 + 1 = 10
U4 = 4^2+ 1 = 17
U5 = 5^2 + 1 = 26

c. U1 = 1^2 + 1 = 2
U2 = 2^2 + 2 = 6
U3 = 3^2 + 3 = 12
U4 = 4^2 + 4 = 20
U5 = 5^2 + 5 = 30

d. U1 = 5x2^1-1 = 5x2^0 = 5 x 1 = 5
U2 = 5 x 2^2-1 = 5 x 2 = 10
U3 = 5 x 2^3-1 = 5 x 2^2 = 5 x 4 = 20
U4 = 5 x 2^4-1 = 5 x 2^3 = 5 x 8 = 40
U5 = 5 x 2^5-1 = 5 x 2^4 = 5 x 16 = 80

Maaf kalo ada kesalahan ^^