Cevap :
formül:
s(AuB)=s(A)+s(B)-s(AnB)
35=3x-1+3x+1-x
35=5x
x=7
s(A)=3.7-1=20
s(B)=3.7+1=22
s(AnB)=7
formül:
s(B-A) =s(B)-s(AnB)
s(B-A) =22-7
s(B-A) =15
formül:
s(AuB)=s(A)+s(B)-s(AnB)
35=3x-1+3x+1-x
35=5x
x=7
s(A)=3.7-1=20
s(B)=3.7+1=22
s(AnB)=7
formül:
s(B-A) =s(B)-s(AnB)
s(B-A) =22-7
s(B-A) =15