Question

If P( A or B) = 2/5, P(B)=1/4 and
P( A and B) = 1/10 find P(A)

Answer 1

p(a) = -3/20

Explanation:

p ( a +b) = p(a)+p(b)

1/10= p(a) +1/4

1/10 - 1/4 = p(a)

p(a) = -3/20