Probability of Pulling & Breaking

This topic has expert replies
User avatar
Senior | Next Rank: 100 Posts
Posts: 32
Joined: Wed Mar 11, 2009 9:56 pm
Location: Whitler, BC, Canada

Probability of Pulling & Breaking

by franciskyle » Mon Apr 20, 2009 2:41 pm
The probability of pulling a black ball out of a glass jar is 1/X. The probability of pulling a black ball out of a glass jar and breaking the jar is 1/Y. What is the probability of breaking the jar?

a) 1/(XY).
b) X/Y.
c) Y/X.
d) 1/(X+Y).
e) 1/(X-Y).
k. Francis

User avatar
Senior | Next Rank: 100 Posts
Posts: 32
Joined: Wed Mar 11, 2009 9:56 pm
Location: Whitler, BC, Canada

by franciskyle » Mon Apr 20, 2009 2:43 pm
Sorry, I just figured it out just after I pressed submit.

Here is my solution:

[spoiler]A * 1/X = 1/Y

A = (1/Y) / (1/X)

A = X / Y[/spoiler]
k. Francis

User avatar
Master | Next Rank: 500 Posts
Posts: 435
Joined: Sat Sep 27, 2008 2:02 pm
Location: San Jose, CA
Thanked: 43 times
Followed by:1 members
GMAT Score:720

by dumb.doofus » Mon Apr 20, 2009 3:50 pm
question on conditional probability..

P(b/a) = P(b intersection a)/P(a)
= 1/y/1/x
= x/y
One love, one blood, one life. You got to do what you should.
https://dreambigdreamhigh.blocked/
https://gmattoughies.blocked/