Question

The 4th term of gp is 16 and the 7th term is 128. Find the first term and the common ratio

Answer 1

Answer:

Step-by-step explain

let first term be a

common ratio be b

ar^3 = 16

ar^6 = 128

deviding both equations

we get r^3 = 2^3

hence r = 2

ar^3 = 16

hence a = 2