formulae

Question 1

p ( A/B ) =

Answer 1

P( A n B) / P (A)

always use this formula for A/B CALCULATIONS ( DONT OVERCOMPLICATE)

Question 2

P ( B) =

Answer 2

P ( 1- B’ )

Question 3

P ( A n B )

Answer 3

p(A) + p(B) - P(A U B )