Q no 1 ans:

A+C+BD+B'D'
Q no 1 man K_ map sy expression derive krna ha K_ map already given ha.......

Q no 2 ans:
Q No 2 Quine Mluskey method sy solve krna ha this is given in handouts page no 110 to 116....
B'C'D+A'CD'+AB'C'+BCD'

Q no 3ans:
Q no 3 man jo expression ha usy algebric rules ko follow krty hoay solve krna ha All ules ae given in handouts page No 73 & 74.....
A'B+A+AB'+BA

more simplifying it u get :

A'B+A(1+B'+B)

=A'B+A(1)

=A'B+A