You are Here: Home >< Maths

# C2 GP Watch

1. Find the number of terms in each of these geometric progressions

3,6,12,...,768 well i just want to know how to do this then ill know all of em
2. The general form of any term in a GP is , r is the term-to-term ratio, 2 in this case, and a must be 3.

So set 768 to the equation for the general form and solve for n. (n is the term number of the last term in the sequence.)
3. did that its not happening dont know how to get past that
4. So

You'll need to take logs to base 2. (Or any base for that matter but 2 is simpler.)

did that its not happening dont know how to get past that

Divide both sides by 3,

Now take logs.

Updated: May 10, 2012
TSR Support Team

We have a brilliant team of more than 60 Support Team members looking after discussions on The Student Room, helping to make it a fun, safe and useful place to hang out.

This forum is supported by:
Today on TSR

It's a dilemma

Poll
Useful resources

### Maths Forum posting guidelines

Not sure where to post? Read the updated guidelines here

### How to use LaTex

Writing equations the easy way

### Study habits of A* students

Top tips from students who have already aced their exams