Answer:
1) Conditional probability 
2) 
Step-by-step explanation:
1) Given that P(A)=0.7 and P(A and B)=0.21
To find the conditional probability :
Conditional probability
when P(A)>0
Substitute the values P(A)=0.7 and P(A and B)=0.21 in above formula we get
![P(B/A)=\frac{0.21}{0.7}[tex]=0.3](https://tex.z-dn.net/?f=P%28B%2FA%29%3D%5Cfrac%7B0.21%7D%7B0.7%7D%3C%2Fp%3E%3Cp%3E%5Btex%5D%3D0.3)
Therefore 
Therefore the Conditional probability 
2) Given that P(A)=0.4 and P(B)=0.7 and also given that Events A and B are independents
To find P(A and B) :

Substitute the values P(A)=0.4 and P(B)=0.7 in above formula we get

=0.28[/tex]
Therefore 