Question

What is the common ratio of the sequence?
6400, 1600, 400, 100, 25,..

Answer 1

Answer: 1/4

Reason:

Pick any term and divide it over the previous term.

• term2/term1 = 1600/6400 = 1/4
• term3/term2 = 400/1600 = 1/4
• term4/term3 = 100/400 = 1/4
• term5/term4 = 25/100 = 1/4

We get the same result 1/4 each time, so this is the common ratio.