],‌ where ‌a,b,c,d,∈{0,1,2} ‌n(s)=34=81 ‌‌ we first bound p ‌(A) ‌|m|=0⇒ad=bc ‌ad=bc=0⇒‌ no. of ‌(a,b,c,d)=(32−22)2=25 ‌ad=bc=1⇒‌ no. of ‌(a,b,c,d)=12=1 ‌ad=bc=2⇒‌ no. of ‌(a,b,c,d)=22=4 ‌ad=bc=4⇒‌ no. of ‌(a,b,c,d)=12=1 ‌:P(A)=‌