Tags:
, view all tags
Homework Seven Quick Answers

1. 2*(263*103) [5.1.18]

2. You can choose 21*21 integer pairs. In the given range 11 are even, 10 are odd. So: (11*11 + 10*10)/21*21 [5.1.20]

3. Count the numbers from 00000 to 99999 - how many 5's appear? C(n,1)*94+C(n,2)*93+C(n,3)*92+ C(n,4)*91 + 1. [5.1.30]

4.(n+1)4 - 1 -- you can pick 0 .. n of any letter, but you can't pick all 0s (hence the - 1 term)

5. 7! / 2!

6.

-- RobbieMoll - 2012-04-26

Edit | Attach | Print version | History: r7 | r5 < r4 < r3 < r2 | Backlinks | Raw View | Raw edit | More topic actions...
Topic revision: r3 - 2012-04-27 - RobbieMoll
 
  • Edit
  • Attach
This site is powered by the TWiki collaboration platform Powered by PerlCopyright © 2008-2019 by the contributing authors. All material on this collaboration platform is the property of the contributing authors.
Ideas, requests, problems regarding UMass CS EdLab? Send feedback

mersin escort adana escort izmir escort gaziantep escort