Fill in the blank space.

Explanation

i) .P(A uu B)=P(A)+P(B)-P(A nn B)=1/3+1/5-1/15=7/15.
ii). .P(A uu B)=P(A)+P(B)-P(A nn B).
.0.6=0.35+P(B)-0.25.
.P(B)=0.6-0.35+0.25=0.85-0.35=0.5.
iii) .P(A nn B)=P(A)+P(B)-P(A uu B)=0.5+0.35-0.7=0.85-0.7=0.15.