GMAT Changed on April 16th - Read about the latest changes here

It is currently 25 May 2018, 04:12

Close

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
Your Progress

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

Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.

Close

Request Expert Reply

Confirm Cancel

Events & Promotions

Events & Promotions in June
Open Detailed Calendar

Ten coins are tossed simultaneously. In how many of the

  post reply Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
Intern
Intern
avatar
Joined: 18 Sep 2005
Posts: 7
Location: Delhi
Ten coins are tossed simultaneously. In how many of the [#permalink]

Show Tags

New post 20 Sep 2005, 23:30
00:00
A
B
C
D
E

Difficulty:

(N/A)

Question Stats:

33% (00:00) correct 67% (01:06) wrong based on 15 sessions

HideShow timer Statistics

Ten coins are tossed simultaneously. In how many of the outcomes will the third coin turn up a head?

A. 210
B. 29
C. 3*28
D. 3*29
E. None of these

--== Message from GMAT Club Team ==--

This is not a quality discussion. It has been retired.

If you would like to discuss this question please re-post it in the respective forum. Thank you!

To review the GMAT Club's Forums Posting Guidelines, please follow these links: Quantitative | Verbal Please note - we may remove posts that do not follow our posting guidelines. Thank you.
Manager
Manager
User avatar
Joined: 03 Aug 2005
Posts: 132
Re: Ten coins are tossed simultaneously. In how many of the [#permalink]

Show Tags

New post 21 Sep 2005, 04:14
I thinnk it is E, 2^9 would be the answer as we have nine coins with two possible outcomes each
Manager
Manager
avatar
Joined: 16 Sep 2005
Posts: 60
Re: Ten coins are tossed simultaneously. In how many of the [#permalink]

Show Tags

New post 21 Sep 2005, 09:10
I came up with E too!
_________________

Thanks

Senior Manager
Senior Manager
avatar
Joined: 29 Nov 2004
Posts: 463
Location: Chicago
Re: Ten coins are tossed simultaneously. In how many of the [#permalink]

Show Tags

New post 21 Sep 2005, 09:26
I get 2^8,

2^9 possible outcomes for other coins and half of that for the third coin being head and half for it being tail...
_________________

Fear Mediocrity, Respect Ignorance

VP
VP
avatar
Joined: 22 Aug 2005
Posts: 1096
Location: CA
Re: Ten coins are tossed simultaneously. In how many of the [#permalink]

Show Tags

New post 21 Sep 2005, 09:28
ranga41 wrote:
I get 2^8,

2^9 possible outcomes for other coins and half of that for the third coin being head and half for it being tail...


Could you explain pls.
I thought 2^9 outsomes from other coins will be for their coin being head AND another 2^9 outcomes from other coins for it to be tail (total outcomes 2^10)
Senior Manager
Senior Manager
avatar
Joined: 13 Jan 2005
Posts: 312
GMAT ToolKit User
Re: Ten coins are tossed simultaneously. In how many of the [#permalink]

Show Tags

New post 23 Sep 2005, 11:02
I got 2^9 outcomes with heads in the third round. Whats the OA?


GA
Intern
Intern
avatar
Joined: 14 Feb 2007
Posts: 24
Re: Ten coins are tossed simultaneously. In how many of the [#permalink]

Show Tags

New post 25 Oct 2007, 00:10
1
This post was
BOOKMARKED
Ten coins are tossed simultaneously. In how many of the outcomes will the third coin turn up a head?

A. 2^10
B. 2^9
C. 3*2^8
D. 3*2^9
E. None of these
SVP
SVP
User avatar
Joined: 29 Aug 2007
Posts: 2427
Re: Ten coins are tossed simultaneously. In how many of the [#permalink]

Show Tags

New post 25 Oct 2007, 00:41
tikpaklong wrote:
Ten coins are tossed simultaneously. In how many of the outcomes will the third coin turn up a head?

A. 210
B. 29
C. 3*28
D. 3*29
E. None of these


i think the answers should be the followings:

A. 2^10
B. 2^9
C. 3*2^8
D. 3*2^9
E. None of these

I take 2^9.
Senior Manager
Senior Manager
User avatar
Joined: 11 Sep 2005
Posts: 302
Re: Ten coins are tossed simultaneously. In how many of the [#permalink]

Show Tags

New post 25 Oct 2007, 02:55
tikpaklong wrote:
Ten coins are tossed simultaneously. In how many of the outcomes will the third coin turn up a head?

A. 210
B. 29
C. 3*28
D. 3*29
E. None of these


My answer: 2^9.............i suppose it's B
Intern
Intern
avatar
Joined: 14 Feb 2007
Posts: 24
Re: Ten coins are tossed simultaneously. In how many of the [#permalink]

Show Tags

New post 25 Oct 2007, 09:31
sorry about the answer choices...yes the official answer is 2^9. Can you guys explain? I'd appreciate it. Thanks.
Director
Director
User avatar
Joined: 20 Aug 2007
Posts: 850
Location: Chicago
Schools: Chicago Booth 2011
Re: Ten coins are tossed simultaneously. In how many of the [#permalink]

Show Tags

New post 25 Oct 2007, 10:00
1
This post was
BOOKMARKED
Total possible outcomes is 2^10

In half the outcomes, the third coin will be tails (in the other half it will be heads).

(2^10)/2 = 2^9

This is also the number of outcomes where the third coin will come up heads.
SVP
SVP
User avatar
Joined: 24 Aug 2006
Posts: 2098
Re: Ten coins are tossed simultaneously. In how many of the [#permalink]

Show Tags

New post 25 Oct 2007, 10:03
1
This post was
BOOKMARKED
tikpaklong wrote:
sorry about the answer choices...yes the official answer is 2^9. Can you guys explain? I'd appreciate it. Thanks.


Basically, the question asks how many different outcomes are there if you toss up 10 coins. The answer to that is 2^10

But since the third coin is heads, we divide the total number of combinations by 2, thus (2^10)/2 = 2^9

OR

How many different outcomes can there be for the 9 remaining coins if the third one is heads? 2^9
Manager
Manager
avatar
Joined: 24 Jul 2007
Posts: 79
Re: Ten coins are tossed simultaneously. In how many of the [#permalink]

Show Tags

New post 28 Oct 2007, 22:14
kidderek wrote:
tikpaklong wrote:
sorry about the answer choices...yes the official answer is 2^9. Can you guys explain? I'd appreciate it. Thanks.


Basically, the question asks how many different outcomes are there if you toss up 10 coins. The answer to that is 2^10

But since the third coin is heads, we divide the total number of combinations by 2, thus (2^10)/2 = 2^9

OR

How many different outcomes can there be for the 9 remaining coins if the third one is heads? 2^9


Great explanation, I am not new to the forum, but I have not been paticipating in the math section...so I am not familiar with the symbals...

Question: 2^9, does this mean 2 to the 9th power??? I am assuming it is...
Non-Human User
User avatar
Joined: 09 Sep 2013
Posts: 6854
Premium Member
Re: Ten coins are tossed simultaneously. In how many of the [#permalink]

Show Tags

New post 22 Nov 2017, 01:26
Hello from the GMAT Club BumpBot!

Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

Want to see all other topics I dig out? Follow me (click follow button on profile). You will receive a summary of all topics I bump in your profile area as well as via email.

--== Message from GMAT Club Team ==--

This is not a quality discussion. It has been retired.

If you would like to discuss this question please re-post it in the respective forum. Thank you!

To review the GMAT Club's Forums Posting Guidelines, please follow these links: Quantitative | Verbal Please note - we may remove posts that do not follow our posting guidelines. Thank you.

_________________

GMAT Books | GMAT Club Tests | Best Prices on GMAT Courses | GMAT Mobile App | Math Resources | Verbal Resources

Re: Ten coins are tossed simultaneously. In how many of the   [#permalink] 22 Nov 2017, 01:26
Display posts from previous: Sort by

Ten coins are tossed simultaneously. In how many of the

  post reply Question banks Downloads My Bookmarks Reviews Important topics  


GMAT Club MBA Forum Home| About| Terms and Conditions and Privacy Policy| GMAT Club Rules| Contact| Sitemap

Powered by phpBB © phpBB Group | Emoji artwork provided by EmojiOne

Kindly note that the GMAT® test is a registered trademark of the Graduate Management Admission Council®, and this site has neither been reviewed nor endorsed by GMAC®.