Got Homework?
Connect with other students for help. It's a free community.
Here's the question you clicked on:
 0 viewing
 Students in class are exchanging pencils.
1 student = 0 exchanges
2 students = 2 exchanges
3 students = 6 exchanges
4 students = 12 exchanges
how many exhcanges for 7 sutudents?
*I know the answer to be: 42 exchanges... but how to get it??? I knwo there is a formula, but I dont knwo how is it and how to use it..* help
 one year ago
 one year ago
 Students in class are exchanging pencils. 1 student = 0 exchanges 2 students = 2 exchanges 3 students = 6 exchanges 4 students = 12 exchanges how many exhcanges for 7 sutudents? *I know the answer to be: 42 exchanges... but how to get it??? I knwo there is a formula, but I dont knwo how is it and how to use it..* help
 one year ago
 one year ago

This Question is Closed

ParthKohliBest ResponseYou've already chosen the best response.1
1 * 0 = 0 2 * 1 = 2 3 * 2 = 6 4 * 3 = 12 5 * 4 = 20 6 * 5 = 30 7 * 6 = 42
 one year ago

raimelgarcia5Best ResponseYou've already chosen the best response.0
yes, thats how i got it... but i know there is a formula... something like an=2n1+(n1) or something like that... (not sure if its that one.... and i know how to use that formula... nor i dont kknow what the formula menas.. :/
 one year ago

OpcodeBest ResponseYou've already chosen the best response.2
Okay. Math in the morning ^_^. There's a pattern. 1 student = 0 exchanges 2 students = 2 exchanges 3 students = 6 exchanges 4 students = 12 exchanges S students = X exchanges S students = X exchanges 7 students = 42 exchanges S = Students X = Exchanges The pattern is how many number of students there is minus one from it then times it by that number. So: S  1 = Number to multiple by let's call it (N). S * N = X Let's test it: First say there are 10 students. 10  1 = 9 10 * 9 = 90 Exchanges. Get it?
 one year ago

OpcodeBest ResponseYou've already chosen the best response.2
Because. The pattern shows that the number multiplied by the students is always one less than it.
 one year ago

raimelgarcia5Best ResponseYou've already chosen the best response.0
still dont get it.. (sorry for the persistance..) i wanna learn math like for real..
 one year ago

OpcodeBest ResponseYou've already chosen the best response.2
So the formula is: (S  1) = N S * N = X S = Students X = Exchanges N = Number to multiple on "S".
 one year ago

OpcodeBest ResponseYou've already chosen the best response.2
Say there is: 120 students = ? exchanges Now use the formula: (S  1) = N S = 120 So (120  1) = 119 N = 119 Now for step two: S * N = X We know what S and N are now so plug in the values: 120 * 119 = 14,280 14,280 = X And again: S = Students X = Exchanges N = Number to multiple on "S".
 one year ago

raimelgarcia5Best ResponseYou've already chosen the best response.0
yeah.. i get that... i just didnt know why N = S1 ... but its ok tho... thanks man! :)
 one year ago

raimelgarcia5Best ResponseYou've already chosen the best response.0
u are a really good helper : )
 one year ago

OpcodeBest ResponseYou've already chosen the best response.2
So the formula is: (S  1) = N < S is for Students (Given) N is for the Number to multiple on "S". IN the pattern to get N. In this case we minus by "1". Then leading us to: S * N = X S = Students X = Exchanges N = Number to multiple on "S". And no problem ^_^.
 one year ago

ParthKohliBest ResponseYou've already chosen the best response.1
I am waiting to help like Opcode. :(
 one year ago

OpcodeBest ResponseYou've already chosen the best response.2
Help me with what O.o? My stuff is just memorizing things like postulates and theorems. Memory with numbers = Head Ache. (For me at lest).
 one year ago
See more questions >>>
Your question is ready. Sign up for free to start getting answers.
spraguer
(Moderator)
5
→ View Detailed Profile
is replying to Can someone tell me what button the professor is hitting...
23
 Teamwork 19 Teammate
 Problem Solving 19 Hero
 Engagement 19 Mad Hatter
 You have blocked this person.
 ✔ You're a fan Checking fan status...
Thanks for being so helpful in mathematics. If you are getting quality help, make sure you spread the word about OpenStudy.