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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