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Edexcel C12 January 2015 Question 12b

Edexcel C12 January 2015 Question 12B
I have looked at Exam Solutions for this question but I still don't understand why do we take away 1 in the end to get 2030?
Why isn't it 2031?
LINK: https://drive.google.com/file/d/0B7NmSVDaZQPtMW11OHNSMVFJWGs/view
Sorry you've not had any responses about this. :frown:

Why not try posting in a specific subject forum- you might have more luck there.

Here's a link to our subject forum which should help get you more responses. :redface:

:h:

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