Time yourself 2. Work this problem on paper as fast as you

Oldest

Best Reply

Author

Message

TAGS:

CEO

Joined: 15 Aug 2003

Posts: 3550

Followers: 55

Kudos [?]: 626 [0], given: 781

Time yourself 2. Work this problem on paper as fast as you [#permalink]

07 Mar 2004, 23:56

1. Time yourself
2. Work this problem on paper as fast as you can ( doing this under 2 mins is our goal)
3. Type your solution here and your time, if possible:)

Go!

Two events A & B are such that P(A) = 0.83, P(B) = 0.25. If C is a set of possible values of probability that A & B both occur, Find the range of C?

Intern

Joined: 12 Jan 2004

Posts: 26

Location: Israel

Followers: 0

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

My answer [#permalink]

08 Mar 2004, 03:57

Am I missing something or is the answer X*Y = 0.2075 (30sec.)?

Director

Joined: 03 Jul 2003

Posts: 716

Followers: 2

Kudos [?]: 4 [0], given: 0

[#permalink]

08 Mar 2004, 06:19

P(C) = 0.2075
(Time less than a minute)

Senior Manager

Joined: 23 Sep 2003

Posts: 327

Location: US

Followers: 1

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

[#permalink]

08 Mar 2004, 06:50

That's a bad question. I don't see how there could be a range. There's only one possible answer and that is 0.207 which is not a range.

SVP

Joined: 30 Oct 2003

Posts: 1963

Location: NewJersey USA

Followers: 3

Kudos [?]: 25 [0], given: 0

[#permalink]

08 Mar 2004, 07:10

If these two events are mutually exclusive then P(A&B) = 0
if these are independent events and not mutually exclusive
P(A&B) = P(A) & P(B) = 0.2075

If they are dependent events
P(A or B) = P(A) + P(B) - P(A&B)
Max of P(A OR B) = 1
P(A&B) = 0.83+0.25 - 1 = 0.08

Range is 0.08 to 0.2075
or the range is
0 to 0.2075

CEO

Joined: 15 Aug 2003

Posts: 3550

Followers: 55

Kudos [?]: 626 [0], given: 781

[#permalink]

08 Mar 2004, 09:30

ndidi204 wrote:

That's a bad question. I don't see how there could be a range. There's only one possible answer and that is 0.207 which is not a range.

nope, i hope to prove that none of you is right.

Range = Maximum - Minimum
1. what is the Maximum possible value of C?
2. what is the Minimum possible value of C?

SVP

Joined: 30 Oct 2003

Posts: 1963

Location: NewJersey USA

Followers: 3

Kudos [?]: 25 [0], given: 0

[#permalink]

08 Mar 2004, 09:44

Hi Praetorian,

Would you mind explaining the solution. Already enough people have pounded on this.

Anand.

CEO

Joined: 15 Aug 2003

Posts: 3550

Followers: 55

Kudos [?]: 626 [0], given: 781

[#permalink]

08 Mar 2004, 09:55

anandnk wrote:

Hi Praetorian,

Would you mind explaining the solution. Already enough people have pounded on this.

Anand.

Sure.

1. The events A and B cannot be mutually exclusive.
P(A) + P(B) > 1
so, the minimum value of C cannot be 0.
the minimum C is 0.83 + 0.25 - 1 = 0.08

2. About the maximum, that will occur when B is a subset of A.
that is C = 0.25

you answer then is Range = 0.25 -0.08 =0.17

questions?

SVP

Joined: 30 Oct 2003

Posts: 1963

Location: NewJersey USA

Followers: 3

Kudos [?]: 25 [0], given: 0

[#permalink]

08 Mar 2004, 11:22

Hmm,

I was atleast half right. Never thought of this scenario where B could be part of A.

Thanks,
Anand.

CEO

Joined: 15 Aug 2003

Posts: 3550

Followers: 55

Kudos [?]: 626 [0], given: 781

[#permalink]

08 Mar 2004, 11:55

anandnk wrote:

Hmm,

I was atleast half right. Never thought of this scenario where B could be part of A.

Thanks,
Anand.

I will give y'all answer choices next time.

[#permalink] 08 Mar 2004, 11:55

	Similar topics	Author	Replies	Last post
Similar Topics:	Rules 1. Time yourself 2. Work your solution on a seperate	Praetorian	9	09 Mar 2004, 16:12
	Rules 1. Time yourself 2. Work your solution on a seperate	Praetorian	3	09 Mar 2004, 16:54
	Rules 1. Time yourself 2. Work your solution on a seperate	Praetorian	7	10 Mar 2004, 20:23
	1. Time yourself people 2. Do this as fast as you can 3.	Praetorian	4	05 Apr 2004, 19:52
	Time yourself.. under 2 mins	haas_mba07	9	27 Aug 2006, 18:16

Time yourself 2. Work this problem on paper as fast as you

Main navigation

GMAT Resources

Partners

MBA Resources

GMAT ® is a registered trademark of the Graduate Management Admission Council ® (GMAC ®). GMAT Club's website has not been reviewed or endorsed by GMAC.

GMAT Courses

Admissions Consulting

Time yourself 2. Work this problem on paper as fast as you

Time yourself 2. Work this problem on paper as fast as you

Main navigation

GMAT Resources

Partners

MBA Resources