# Concrete Mathematics: A Foundation for Computer Science (2nd Edition)

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https://www.amazon.com/Concrete-Mathematics-Foundation-Compu...

Have a look here: "

Is it possible to do modulo of a fraction" on math.stackexchange.com.To work through your problem, you have

`a = 7 * (4/11) = 28/11`

, and`b = 10`

.`a / b`

= (28/11)/10 = 0.25454545...`⌊a/b⌋`

= 0`b ⌊a/b⌋`

= 0 * 0 = 0`a - b ⌊a/b⌋`

= 28/11 - 0 = 28/11This means your answer is 28/11.

Wolfram Alpha agrees with me and gives

`28/11`

as theexactresult. Google also agrees, but gives it as a decimal, 2.54545454.....A fraction

isanexactanswer and not a decimal.I suggest books with good tutorials throughout if you're unable to partake in a maths course. For computer science-related maths Don Knuth's Concrete Mathematics is meant to be very good.

Obviously nothing can replace a good teacher, but good tutorials can come pretty damn close. You really get to learn the subject in the tutorials I think.

There is a good book, that I think would help you to get more out of computer science research papers and dissertations. It's called "

Concrete Mathematics: A foundation for Computer Science", and it's available on Amazon:http://www.amazon.com/Concrete-Mathematics-Foundation-Computer-Science/dp/0201558025/ref=sr_1_1?s=books&ie=UTF8&qid=1341081763&sr=1-1&keywords=math+computer+science

I think this would help because it will all be relevant, and its consolidated which will help expedite the learning process.

Even if you don't have any money, just Google it and take a look at the index to get an idea of what areas you might want to learn.

And here's one more interesting book.

http://www.amazon.com/Concrete-Mathematics-Foundation-Computer-Science/dp/0201558025

I also suggest you to join this Coursera course, Algorithms: Design and Analysis by Tim Roughgarden[2]. Currently the course is open, so you can sign up for classes. The course is offered in two parts[3], complete both of them.

Once you are comfortable with basic concepts start solving questions/puzzles online on sites like SPOJ[4], UVa[5], (YC-funded) HackerRank[6]. You could try TopCoder[7] also, but the questions are bit difficult. Hope this helps.

PS - You should study math, because it is important in Algorithms Analysis. You could try reading required parts of Concrete Mathematics by Knuth[8] or as you come across new concepts, Google and understand them.

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Just from a search, there are some great results:

1.

Mathematics for Computer Science- HN Submissions: http://www.amazon.com/Mathematics-Content-Methods-Meaning-Do...[2.] http://www.amazon.com/Concrete-Mathematics-Foundation-Comput...