In the January 2006 paper (MPC2) there is this question:
I've done part a and b, but I don't understand how they get 75 for part c. Here's the mark scheme:
Why did they use sum to infinity when it's talking about terms?
Turn on thread page Beta
AQA MPC2 Limits Question watch
- Thread Starter
- 05-01-2013 15:58
- 05-01-2013 15:59
At infinity the terms do not change so Un+1 = Un
That means you can put L into both sides of your formula
- 05-01-2013 16:02
L=pL + q
L=0.6L + q
Because if L is the limit, Un+1 is still L so therefore Un+1= L.
rearrange that to become 0.4L=q.
L = 75 (assuming you sub the correct value of q)