It is currently 24 Jun 2017, 08:58

### 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

# Martin writes five letters to five different addressees;

Author Message
SVP
Joined: 03 Feb 2003
Posts: 1604

### Show Tags

26 Sep 2003, 00:58
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.

Martin writes five letters to five different addressees; Morris prepares five envelops; and Michael packs the letters into the envelops at random.

I. What is the probability of having all the letters packed correctly?
II. What is the probability of having exactly two letters packed wrongly?
Senior Manager
Joined: 22 Aug 2003
Posts: 257
Location: Bangalore

### Show Tags

26 Sep 2003, 10:11
1) Number of ways letters can be put in envelopes = 5!
Number of ways to put them correctly = 1
Thus, probability = 1/5! = 120

2) Number of ways letters can be put in envelopes = 5!
Number of ways of getting exactly two wrong = 5C3*1*1 = 10
Thus probability = 10/120 = 1/12

Stolyar, what are the correct answers..
SVP
Joined: 03 Feb 2003
Posts: 1604

### Show Tags

26 Sep 2003, 11:18
My logic and answers are the same. There are no official answers—I invented the question today.
26 Sep 2003, 11:18
Display posts from previous: Sort by