Question

Find the 15th term of the geometric sequence 4, 8, 16, ...4,8,16,...

Answer 1

Explanation:

Tn = ar^(n-1)

a = 4, r = 8/4 = 2 for n = 15

T15 = 4 × 2^(15-1)

= 4 × 2^14

= 4 × 16384

= 65536