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# AQA MPC2 Limits Question watch

1. 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?
2. At infinity the terms do not change so Un+1 = Un

That means you can put L into both sides of your formula
3. 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)

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Updated: January 5, 2013
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