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The books are called "Essential Mathematics" 1 and 2. They correspond to these modules. http://www.openuniversity.edu/courses/modules/mst124 http://www.openuniversity.edu/courses/modules/mst125

Second-hand OU books are usually bought from https://www.universitybooksearch.co.uk/

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Could you provide the direct links for the books used in: MST123, MST124, MST125? I could not find them in your links.

Search for "Open University MST124" or similar on www.ebay.co.uk or www.amazon.co.uk. There seem to be plenty of copies of 124 available on both at the time of writing.

If you're not in the UK, I see that Thriftbooks appears to get at least some copies[1].

1: https://www.thriftbooks.com/browse/?b.search=MST124#b.s=most...

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