Posted by **Monica** on Saturday, October 7, 2006 at 2:06pm.

100 people set up a phone call system so that the initial contact person call three persons, each of whom calla three persons,and so on until all have been contacted. The maximum people who do not need to make calls is?

Very Simple Question

How would you solve it:

(1+x^2)(1-x^3)

(1+x^2)(1-x^3)

This is the same as

1*(1-x^3) + (x^2)*(1-x^3) = 1 - x^3 + x^2 - x^5

We have

1 who call 3

1+3 who call 3

1+3+9 who call 3

1+3+9+27 who call the remaining 60 who don't need to call anyone.

So it looks like 40 will need to call someone and 60 won't need to call anyone. If I understand the question correctly.

Check that, of the last 27 who need to call, not everyone made a call. There were 60 people remaining to be called and only 20 of the 27 needed to call someone. 7 of the 27 didn't need to call anyone, so 67 people total did not need to call anyone. Check this too.

## Answer this Question

## Related Questions

- Math - An unusual die has six faces labelled 1,2,3,5,7 9. If two of these dice ...
- math - A town of 1200 people has "fan-out" system for emergencies. In an ...
- Math - If I have 4 people and I want to take a picture of them standing side by ...
- Math - A phone tree is used to let committee members know that a meeting is ...
- math - i have no clue how to do this problem. any help would be appreciated...
- math - if a phone team asks each person to call two people, how many rounds will...
- college - Four hundred people apply for three jobs. 130 of the applicants are ...
- 5th grade - If a phone team asks each person to call two people, how many rounds...
- 6th grade math - Can you check #18 and explain how to do #15 please? 15. Sue ...
- phone charges project - Okay I need to know something about cell phones and land...

More Related Questions