Waste less time on Facebook — follow Brilliant.
×

Letters and Envelopes Problem

There are 5 letters and 5 envelopes and for each letter there is only one right envelope present.In how many ways can one put the letters in the envelopes so that no letter is in the right envelope? I would be really glad to get a hint about its solution.

Note by Sazzad Sayyed
4 years, 6 months ago

No vote yet
1 vote

  Easy Math Editor

MarkdownAppears as
*italics* or _italics_ italics
**bold** or __bold__ bold

- bulleted
- list

  • bulleted
  • list

1. numbered
2. list

  1. numbered
  2. list
Note: you must add a full line of space before and after lists for them to show up correctly
paragraph 1

paragraph 2

paragraph 1

paragraph 2

[example link](https://brilliant.org)example link
> This is a quote
This is a quote
    # I indented these lines
    # 4 spaces, and now they show
    # up as a code block.

    print "hello world"
# I indented these lines
# 4 spaces, and now they show
# up as a code block.

print "hello world"
MathAppears as
Remember to wrap math in \( ... \) or \[ ... \] to ensure proper formatting.
2 \times 3 \( 2 \times 3 \)
2^{34} \( 2^{34} \)
a_{i-1} \( a_{i-1} \)
\frac{2}{3} \( \frac{2}{3} \)
\sqrt{2} \( \sqrt{2} \)
\sum_{i=1}^3 \( \sum_{i=1}^3 \)
\sin \theta \( \sin \theta \)
\boxed{123} \( \boxed{123} \)

Comments

Sort by:

Top Newest

Thanks for the reply.

Sazzad Sayyed - 4 years, 5 months ago

Log in to reply

ya it is the no. of derangements

Sitesh Pattanaik - 4 years, 6 months ago

Log in to reply

I think the answer is 44.

Bhargav Das - 4 years, 5 months ago

Log in to reply

Hi; You want the number of derangements. This link covers it all.

link

Bobbym None - 4 years, 6 months ago

Log in to reply

×

Problem Loading...

Note Loading...

Set Loading...