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

 It is currently 25 Oct 2016, 14:54

### 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

# 35 - Probability

Author Message
Joined: 31 Dec 1969
Location: Russian Federation
Concentration: Entrepreneurship, Technology
GMAT 1: 710 Q49 V0
GMAT 2: 700 Q V
GMAT 3: 740 Q40 V50
GMAT 4: 700 Q48 V38
GMAT 5: 710 Q45 V41
GMAT 6: 680 Q47 V36
GMAT 7: Q42 V44
GMAT 8: Q42 V44
GMAT 9: 740 Q49 V42
GMAT 10: 740 Q V
GMAT 11: 500 Q47 V33
GMAT 12: 670 Q V
GPA: 3.3
WE: Engineering (Manufacturing)
Followers: 0

Kudos [?]: 186 [0], given: 99982

### Show Tags

11 Nov 2004, 03:34
This topic is locked. If you want to discuss this question please re-post it in the respective forum.

a question from the GMATCLUB forsaleqeustions:

what is the prob of bearing two boys from four born babies ?

a. 1/5
b. 1/8
c. 1/2
d. 3/8
e. 6/11
Senior Manager
Joined: 16 Aug 2004
Posts: 327
Location: India
Followers: 1

Kudos [?]: 47 [0], given: 0

### Show Tags

11 Nov 2004, 03:59
Sweet and Simple Option c
GMAT Club Legend
Joined: 15 Dec 2003
Posts: 4302
Followers: 37

Kudos [?]: 409 [0], given: 0

### Show Tags

11 Nov 2004, 04:31
D) 3/8
Prob of getting boy: 1/2
Prob of getting girl: 1/2
Prob of getting exactly 2 boys and 2 girls: (1/2)^4
Pattern: BBGG --> 2 boys can take 4C2=6 different positions
_________________

Best Regards,

Paul

Senior Manager
Joined: 06 Dec 2003
Posts: 366
Location: India
Followers: 1

Kudos [?]: 10 [0], given: 0

### Show Tags

11 Nov 2004, 12:58
yeah paul, u are correct

conceiving 2 boys from 4 babies can be possible in 4C2 = 6 ways
and probability to get boy baby / gal baby is (1/2)

So the probability to get exactly 2 boy babies - 6 * (1/2)^4 = 3/8
_________________

Perseverance, Hard Work and self confidence

Manager
Joined: 28 Jul 2004
Posts: 54
Followers: 1

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

### Show Tags

17 Nov 2004, 07:02
total outcomes 1/2^4=16

possible combinations

B1 G G B2
B2 G G B1
B1 G B2 G
B2 G B1 G
G B1 B2 G
G B2 B1 G

so ...... 6/16=3/8
_________________

Jim

Joined: 31 Dec 1969
Location: Russian Federation
Concentration: Entrepreneurship, Technology
GMAT 1: 710 Q49 V0
GMAT 2: 700 Q V
GMAT 3: 740 Q40 V50
GMAT 4: 700 Q48 V38
GMAT 5: 710 Q45 V41
GMAT 6: 680 Q47 V36
GMAT 7: Q42 V44
GMAT 8: Q42 V44
GMAT 9: 740 Q49 V42
GMAT 10: 740 Q V
GMAT 11: 500 Q47 V33
GMAT 12: 670 Q V
GPA: 3.3
WE: Engineering (Manufacturing)
Followers: 0

Kudos [?]: 186 [0], given: 99982

### Show Tags

17 Nov 2004, 10:04
using binominal formula will give a straightforward answer: ( 1/2+1/2)^4 gives all posible outcomes.
Display posts from previous: Sort by