If P A B 0 8 and P A B 0 3 then P A 39 P B 39 equals to ...

If P(A?B)=0.8 and P(A?B)=0.3,then P(A')+P(B') equals to?

Here P(A'?B')=1-P(A?B)

 =1-0.8

 =0.2

 P(A'?B')=1-P(A?B)

=1-0.3

=0.7                                  

 As we know that-

P(A'?B')=P(A')+P(B')-P(A'?B')

0.7=P(A') +P(B')-0.2

P(A')+P(B')=0.7+0.2=0.9

By: bhavesh kumar singh