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

 It is currently 03 May 2015, 02:19

### 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

# The probability for event A to occur is 0.6, and for B to

Author Message
TAGS:
Intern
Joined: 23 Dec 2005
Posts: 18
Followers: 0

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

The probability for event A to occur is 0.6, and for B to [#permalink]  24 Apr 2006, 02:29
The probability for event A to occur is 0.6, and for B to occur is 0.5. What is the probability that neither event A nor event B will occur?
Senior Manager
Joined: 08 Jun 2004
Posts: 499
Location: Europe
Followers: 1

Kudos [?]: 20 [0], given: 0

9/10

(1-6/10)+(1-5/10)=9/10.
Senior Manager
Joined: 09 Mar 2006
Posts: 445
Followers: 1

Kudos [?]: 6 [0], given: 0

(1-6/10)*(1-5/10) = 20/100 = 1/5 = 0.2
Intern
Joined: 28 Nov 2005
Posts: 35
Followers: 0

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

If we assume that A and B are independant, then we have:
P(N)=1-[P(A)+P(B)-P(AnB)]
=1-[6/10+5/10 - 6/10*5/10]
=1-[11/10- 3/10]
=1-[8/10]
=2/10
=0.2

Is that correct?
(N=Neither A, nor B)
Intern
Joined: 23 Dec 2005
Posts: 18
Followers: 0

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

OA is 0.2

Thanks guys!
Senior Manager
Joined: 08 Jun 2004
Posts: 499
Location: Europe
Followers: 1

Kudos [?]: 20 [0], given: 0

Ethan wrote:
OA is 0.2

Thanks guys!

OOOPPPSSS

It should be multiplied not added.
GMAT Club Legend
Joined: 07 Jul 2004
Posts: 5078
Location: Singapore
Followers: 22

Kudos [?]: 184 [0], given: 0

Alternatively,

P(!A) = 0.4
P(!B) = 0.5

P(!A AND !B) = 0.4 * 0.5 = 0.2
Similar topics Replies Last post
Similar
Topics:
4 What is the probability that events A and B both occur? If 7 05 Mar 2008, 21:15
Probability of event A is 0.5, of B is 0.6 and of C is 0.9. 2 20 Sep 2007, 23:31
What is the probability that events A and B both occur? (1) 9 24 Aug 2006, 22:08
The probability that event A occurs is 0.5, event B occurs 4 01 Apr 2006, 22:37
Another simple one The probability that event A occurs 7 04 Feb 2006, 22:33
Display posts from previous: Sort by