diketahui barisan berikut 1,1/2,1/4,1/8,1/16 tentukan:a.suku pertama b.suku ke 7

a. U1 = a = 1
b.
U2/U1 = ar^2-1/ar^1-1
1/2 /1 = ar/a
1/2 / 1 = r
1/2 = r

U7 = a r^n-1
U7 = 1 (1/2)^6
U7 = 1 (1/64)
U7 = 1/64