Question

2. Tentukan rumus suku ke (n)
a. 2, -2, 2, -2, -2
b. 16, 8, 4, 2, 1
c. 18, 9, 8, 7, 6

Answer 1

A.  r = -1
    Un = ar^(n-1)
         = 2(-1)^(n-1)

b. r = 1/2
 Un = ar^(n-1)
      = 16(1/2)^(n-1)

c. belum bisa