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Discrete Mathematics DeMYSTiFied

https://www.amazon.com/Discrete-Mathematics-DeMYSTiFied-Steven-Krantz/dp/007154948X/

this is free online
Discrete Mathematics An Open Introduction, 3rd edition
http://discrete.openmathbooks.org/pdfs/dmoi-tablet.pdf

http://discrete.openmathbooks.org/dmoi3.html

get these from amazon or your local library

Discrete Mathematics DeMYSTiFied 1st Edition
https://www.amazon.com/Discrete-Mathematics-DeMYSTiFied-Steven-Krantz/dp/007154948X/

2000 Solved Problems in Discrete Mathematics 1st Edition
https://www.amazon.com/2000-Solved-Problems-Discrete-Mathematics/dp/0070380317/

Schaum's Outline of Discrete Mathematics, Revised Third Edition (Schaum's Outlines) 3rd Edition
https://www.amazon.com/Schaums-Outline-Discrete-Mathematics-Revised/dp/0071615865