SOLUTION: What is the next three series of numbers in 6400, 3200, 1600, 800 and why? Are they arithmetic or geometric?

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Question 943639: What is the next three series of numbers in 6400, 3200, 1600, 800 and why? Are they arithmetic or geometric?

Found 2 solutions by rfer, MathTherapy:
Answer by rfer(16322) About Me  (Show Source):
You can put this solution on YOUR website!
Cut in half in each step.
800, 400, 200, 100
Arithmetic

Answer by MathTherapy(10552) About Me  (Show Source):
You can put this solution on YOUR website!

What is the next three series of numbers in 6400, 3200, 1600, 800 and why? Are they arithmetic or geometric? 
This is a GP (Geometric progression)

r, or common ratio is: 1%2F2

Notice that:

1%5E%28st%29+term%22%2A%221%2F2%22=%222%5E%28nd%29+term

2%5E%28nd%29+term%22%2A%221%2F2%22=%223%5E%28rd%29+term, 

and so on!!

Do you think you can now find your terms?       

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