1)
P(neither ring nor necklace) = 0.60
P(ring)=0.20
P(necklace)=0.30
let P(ring and necklace) = x
total sample space = 1
P(ring or necklace)+P(neither ring nor necklace) = 1
P(ring)+P(necklace)- P(ring and necklace) +P(neither ring nor necklace) =1
0.20+0.30-x+0.60=1
x = 0.10
so, P(ring and necklace) =0.10
a) P(necklace or ring) = P(ring)+P(necklace)- P(ring and necklace)=0.20+0.30-0.10=0.40
b)P(ring and necklace) = 0.10 (as calculated earlier)
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