Hi. I would be terribly grateful for your help. I am a second year student, and I am pretty sure I will major in Mathematics, and will probably (if I'm smart enough), do maths post-grad.
I was looking through the faculty handbook, and saw that for 2nd year math they offered a module on Discrete Structures. On the Information sheet they describe it as generally useful for mathematics. Unfortunately, I am just not able to fit this module on to my time-table, and so cannot take it.
The description they give is:

It is not a required module to major in mathematics, but from what I understand, this is important stuff.
Is Discrete Structures worth studying in my own time? If so, what textbooks would you recommend?
Thank-you.