Check GMAT Club Decision Tracker for the Latest School Decision Releases https://gmatclub.com/AppTrack

 It is currently 29 May 2017, 23:46

### 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

# I drop a rubic cube on a carpet and it lands on one of it's

Author Message
Manager
Joined: 12 Mar 2003
Posts: 59
Followers: 1

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

I drop a rubic cube on a carpet and it lands on one of it's [#permalink]

### Show Tags

03 Aug 2003, 08:07
00:00

Difficulty:

(N/A)

Question Stats:

0% (00:00) correct 0% (00:00) wrong based on 0 sessions

### HideShow timer Statistics

This topic is locked. If you want to discuss this question please re-post it in the respective forum.

I drop a rubic cube on a carpet and it lands on one of it's corners. The probaility of this happening is 1/40. If I drop the cube 5 times, what is the chance that it will land on its corner 3 times ?

Assume that all sides and corners are the same.

SVP
Joined: 03 Feb 2003
Posts: 1604
Followers: 9

Kudos [?]: 269 [0], given: 0

### Show Tags

03 Aug 2003, 10:49
Assuming that all the corners are the same, the probability of placing the cube three times out of five on the corner is 1/40*1/40*1/40*39/40*39/40*5C3=10*39*39/40^5

three corners, two noncorners, and all possible combinations (3+2)
Intern
Joined: 18 Jul 2003
Posts: 10
Location: Mumbai
Followers: 0

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

### Show Tags

04 Aug 2003, 23:33
Binomail Method can be used:

p1 = probability that the cube lands on a corner = 1/40
p2 = probability that the cube does not land on a corner = 39/40

P = 5C3 (p1)^3 (p2)^2

This is the same as the answer given by Stolyar
Intern
Joined: 01 Aug 2003
Posts: 48
Location: Mumbai
Followers: 1

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

### Show Tags

05 Aug 2003, 22:23
I still cant understand the expln. Can someone pls explain it again - and not with Binomial Dist. I dont know what B.D. means!
05 Aug 2003, 22:23
Display posts from previous: Sort by