The probability of pulling a black cap out of a cupboard is 1/x.the probability of pulling a black cap out of a cupboard and dropping a glove is 1/y.what is the probability of dropping a glove?
1/(xy), x/y, y/x, 1/x+y

Question

anonymous · Answer

help me

jamesj · Answer

In general, if A and B are events,
Pr(A and B) = Pr(A|B) . Pr(B)

For Pr(A|B) we say "The probability of A given B"

anonymous · Answer

thks for the help  jemesj

anonymous · Answer

can u solve this also 
A rectangular field is divided in to a metre grid like in the coordinate system .centre being the origin of the grid. What is the area of the rectangular flower bed with the following coordinates (x,y),(10,y),(10,5),(x,5) in the field?
6, 8, 12, cannot be determined

jamesj · Answer

On your original question
Pr(black cap) = 1/x
Pr(black cap and dropped glove) = 1/y

Now it's also true if the events are independent that
Pr(black cap and dropped glove) = Pr(black cap).Pr(dropped glove)

Hence
Pr(dropped glove) = Pr(black cap and dropped glove) / Pr(black cap)
                             = 1/y / (1/x)
                             = x/y

jamesj · Answer

Post your new question on the left and someone will help you.