Help! More counting problems

  • Thread starter Magotine
  • Start date
  • #1
2
0
Hi,

I've done more questions. Hopefully the wordings on these word problems aren't vague.

Could someone take a look? I'm not sure if I've thought about the problem the right way. :smile:

Thanks v. much in advance.
 

Attachments

Answers and Replies

  • #2
arildno
Science Advisor
Homework Helper
Gold Member
Dearly Missed
9,970
132
Try to learn LATEX, don't use the doc-format
 
  • #3
0rthodontist
Science Advisor
1,230
0
In the first one, the confusion is that you only need 5 letters to define a 9 letter palindrome. If you know the first 5 letters are ABCDE, then you know the last 4 letters are DCBA. So you only get to choose the first 5 letters, so that's how many possibilities there are.

In the second one, count the number of bridges available at each step. First step: 3 bridges. Second step: 4 bridges. Third step (going back): three bridges because you can't use the one you came on. Fourth step: 2 bridges
 
Last edited:

Related Threads on Help! More counting problems

  • Last Post
Replies
2
Views
723
  • Last Post
Replies
8
Views
3K
  • Last Post
Replies
3
Views
1K
  • Last Post
Replies
3
Views
1K
  • Last Post
Replies
6
Views
3K
  • Last Post
Replies
4
Views
2K
  • Last Post
Replies
6
Views
1K
  • Last Post
Replies
19
Views
2K
  • Last Post
Replies
12
Views
847
  • Last Post
Replies
2
Views
1K
Top