Events & Promotions
|
|
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
Track
Your Progress
Practice
Pays
Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.
Mar 2911:30 AM EDT
-12:30 PM EDT
Learn how Keshav, a Chartered Accountant, scored an impressive 705 on GMAT in just 30 days with GMATWhiz's expert guidance. In this video, he shares preparation tips and strategies that worked for him, including the mock, time management, and more.
Mar 3005:30 AM PDT
-07:30 AM PDT
We know Strengthen and Weaken questions account for more than 50% of the CR questions on the GMAT. With CR becoming even more important on GMAT Focus, it's time you strengthen your weaknesses with an approach that improves your solving time and accuracy!
Mar 3011:00 AM IST
-01:00 PM IST
Attend this session to evaluate your current skill level, learn process skills, and solve through tough Arithmetic questions.
Mar 3110:00 AM EDT
-11:59 PM EDT
The Target Test Prep team has recently introduced TTP OnDemand GMAT, a 400-hour live masterclass video course created by Scott Woodbury-Stewart, founder and CEO of Target Test Prep.
Apr 0308:00 PM PDT
-09:00 PM PDT
Full-length FE mock with insightful analytics, weakness diagnosis, and video explanations!
B
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
25%
(medium)
Question Stats:
62% (00:39) correct
38%
(00:37)
wrong
based on 1246
sessions
History
Date
Time
Result
Not Attempted Yet
When tossed, a certain coin has equal probability of landing on either side. If the coin is tossed 3 times, what is the probability that it will land on the same side each time?
A. 1/8
B. 1/4
C. 1/3
D. 3/8
E. 1/2
A. 1/8
B. 1/4
C. 1/3
D. 3/8
E. 1/2
17 Aug 2010, 07:24
Kudos
Bookmarks
udaymathapati
When tossed, a certain coin has equal probability of landing on either side. If the coin is tossed 3 times, what is the probability that it will land on the same side each time?
A. 1/8
B. 1/4
C. 1/3
D. 3/8
E. 1/2
A. 1/8
B. 1/4
C. 1/3
D. 3/8
E. 1/2
Winning scenario is if we'll have either three tails (TTT) or three heads (HHH):
\(\frac{1}{2}*\frac{1}{2}*\frac{1}{2}+\frac{1}{2}*\frac{1}{2}*\frac{1}{2}=\frac{1}{4}\).
Answer: B.
25 Dec 2007, 13:06
Kudos
Bookmarks
There are 8 possibilities for outcomes when flipping a fair coin 3 times.
2*2*2=2^3=8
of these 8 possibilities there are 2 with the coin landing on the same side each time. HHH and TTT.
so the probability is 2/8 or 1/4.
HHH -- works
HHT
HTH
HTT
THH
THT
TTH
TTT -- works
the standard .5*.5*.5=1/8 but that's just the probability of getting one SPECIFIC side 3 times in a row (ie probability of 3 heads). Since they don't care if it's 3 heads or 3 tails you have to multiply 1/8 by 2 (so now it's the probability of 3 heads OR 3 tails)
2*2*2=2^3=8
of these 8 possibilities there are 2 with the coin landing on the same side each time. HHH and TTT.
so the probability is 2/8 or 1/4.
HHH -- works
HHT
HTH
HTT
THH
THT
TTH
TTT -- works
the standard .5*.5*.5=1/8 but that's just the probability of getting one SPECIFIC side 3 times in a row (ie probability of 3 heads). Since they don't care if it's 3 heads or 3 tails you have to multiply 1/8 by 2 (so now it's the probability of 3 heads OR 3 tails)
