Then i have tried to group them in according to there most common terms as possible, then leads me to Y=A'B'C'(D'+D)+A'B'CD+A'B(C'D+CD')+B'D'(AC'+AC)+ABD'(C'+C);

after that, i tried to simplify all in parentheses such as D'+D=1,AC'+AC=A,C'+C=1. But then i have some problem with one of the equation which was in the parenthesis like A'B(C'D+CD') in the equation above...how will i then simplify that? can i ask some suggestions on how will i gruop my unsimplified to make it easier to simplify? or is A'B(C'D+CD')=?, can it be simplified? or is it =1 or =0? Well, i have this software tells me that according to my unsimplified equation, its minimized form should be like this Y=AD'+A'B'D+A'C'D+BCD'+B'C'D'; how will i come up with this? please i realyy need help..i want to pass this subject...