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:


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.

  1. 👍
  2. 👎
  3. 👁

Respond to this Question

First Name

Your Response

Similar Questions

  1. Mathematics

    Jon is working on a city councilperson’s election campaign. He wants to survey potential voters about their opinions. Which is the best way for him to gather a sample? Attend a speech given by the councilman and survey audience

  2. Educational techno

    Which is the best reason to be wary of those you talk to online đź”˝-They may not be who they say they are -You dont where they live -You dont know their favorite foods How can you stay safe on the internet -create a screen name

  3. Math

    A phone tree is used to let committee members know that a meeting is cancelled. The committee chair calls 5 people . Those 5 people each call 5 people and those additional people each call 5 people. How many members have been

  4. English

    Identify the correct sentence. a.She doesn't call me no more. b.She doesn't never call me no more. c.She doesn't call me anymore. d.She doesn't ever call me no more.

  1. Statistics (Poisson)

    Cars arrive at a toll booth according to a Poisson process with mean 80 cars per hour. How long can the attendant's phone call last if the probability is at least .4 that no cars arrive during the call. The book's answer is 23

  2. math

    43. A phone company charges 10 cents per minute for the first 3 minutes of a call, and 10-cents for each minute thereafter.What is the cost, in cents, of a 10-minute phone call? a. 200-20c b.100c+70 c. 30+7c d.100-7c e. 100-70c

  3. Communication

    What are some characteristics of respectful phone communication? Select all the apply. A) Return phone calls promptly B) Introduce yourself immediately in voice mail of phone call C) State your purpose and be specific D) Provide

  4. grammar

    Which one is correct? We will follow up the patient with a postop phone call? or We will follow up with the patient with a postop phone call?

  1. math

    a phone tree is used to let committee members know ameeting is cancelled. The committee chair calls 5 people Those 5 people each call 5 people, and those additional people call 5 people. how many members have been called

  2. English

    1. Thank you for calling. 2. Thank you for your calling. 3. Thank you for your call. 4. Thank you for call. 5. Thank you for calling me. 6. Thank you for your phone call. 7. Thank you for making a phone call. 8. Thank you for

  3. english

    Which sentence uses who correctly? a. Who did you call? b.Who is the person that I should call? c.To who are you speaking? d. From who did you receive the call? i think the answer is A but i just want someone to check and see


    A phone company charges $0.40 per long distance call plus $0.20 per minute. Find the cost of an 18-minute long distance phone call. Please explain it if you can

You can view more similar questions or ask a new question.