Question 49

Jambmaths question: 

X and Y are two events. The probability of X or Y is 0.7 and the probability of X is 0.4. If X and Y are independent. Find the probability of Y

Option A: 

0.30

Option B: 

0.50

Option C: 

0.57

Option D: 

1.80

Jamb Maths Solution: 

$\begin{align}  & Prob(XorY)=P(X\cup Y) \\ & P(X\cup Y)=0.7 \\ & P(X\cup Y)=p(X)+p(Y) \\ & 0.7=0.4+p(Y) \\ & p(Y)=0.3 \\\end{align}$

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