Find all School-related info fast with the new School-Specific MBA Forum

 It is currently 03 Jun 2015, 10:34

### GMAT Club Daily Prep

#### Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.

Customized
for You

we will pick new questions that match your level based on your Timer History

Track

every week, we’ll send you an estimated GMAT score based on your performance

Practice
Pays

we will pick new questions that match your level based on your Timer History

# Events & Promotions

###### Events & Promotions in June
Open Detailed Calendar

# Let A and B be events such that P(A ^ B) = 1/4, P(

Author Message
TAGS:
SVP
Joined: 16 Oct 2003
Posts: 1815
Followers: 4

Kudos [?]: 54 [0], given: 0

Let A and B be events such that P(A ^ B) = 1/4, P( [#permalink]  04 Nov 2003, 12:40
Let A and B be events such that P(A ^ B) = 1/4, P( ╦Ь A) = 1/3, and P(B) =
1/2. What is P(A U B)?
Intern
Joined: 04 Oct 2003
Posts: 42
Location: Silicon Valley, CA
Followers: 0

Kudos [?]: 1 [0], given: 0

does P(A ANd B) mean P(A OR B)

the formula that you are looking for i s
P(A OR B) = P(A) + P(B) - P (A AND B)
= 1 - P(~A) + P(B) - P(A AND B)
= 1 - 1/3 + 1/2 - 1/4
= 11/12
SVP
Joined: 03 Feb 2003
Posts: 1608
Followers: 6

Kudos [?]: 78 [0], given: 0

agree
P(A OR B) = P(A) + P(B) - P (A AND B)
1/4=2/3+1/2-X
X=11/12
Similar topics Replies Last post
Similar
Topics:
4 P(A), P(B), P(C); Range of Intersection of A, B and C 4 31 Oct 2012, 08:04
p^a q^b r^c s^d= x, where x is a perfect square. If p, q, r, 6 11 Mar 2008, 11:27
1 P(A)=1/3 P(B)=3/4 P(C)=3/5 is there a difference between 6 17 Jan 2008, 07:47
Event A and Event B are independent. Is the probability that 6 23 Oct 2007, 07:13
Is q^b a divisor of p^a ? 1. a>b 2. p is a multiple of q 8 14 Aug 2005, 15:06
Display posts from previous: Sort by