LetAandBbe events with P(A) = 2/5, P(B) = 1/2, P(AnB) = 3/20. Calculate the

following probabilities.

i) P(Ac) (means probabilty of Not A)

ii) P(A UB)

iii) P(Ac nB)

iv) P(B\A)

I know:

1) P(Ac)= 1-2/5= 3/5

2)P(A UB)= 2/5+1/2-3/20 = 3/4

But i am stuck on

iii) P(Ac nB)

iv) P(B\A)

Can anyone help me please