April 19, 2014

Homework Help: Math+ confused?!

Posted by Math on Tuesday, May 15, 2007 at 2:11pm.

I had to solve for this:

1) choose 4 people from a class of 12
My answer:
n=12 r=4
12C4 = 495

2) chosse 8 people from a class of 12
my answer:
12C8 = 495

why is it that they both eqaul 495? maybe I am doing it wrong but I am confused why do they both equal 495?

They are the same, both 2 from the mean of 6. If you do 12C6, you get the max. A neat thing to do is to graph each possibilty,
12C3 and so on until


Graph number combinations vs n.

If you smooth it up, you get the binomial approximation to the normal probability curve.

thanks bobpursley

to go along with what bobpursley showed you, try to finish this pattern

1 1
1 2 1
1 3 3 1
1 4 6 4 1
1 5 10 10 5 1
to get a new number, add the one immediately above and one to the left, the left column is made up of 1's

This is Pascal's Triangle. Look at the row that starts with 1 12 ...
Did you notice something?

Answer this Question

First Name:
School Subject:

Related Questions

Math - Tell me how to figure out these probabilities In how many different ...
Math - How many ways can 5 people be arranged in a straight line if there are 12...
math - How many people do you need in a room in order to guarantee that there is...
maths - Sixty people were asked how many films they had seen in the past year. ...
6th grade math - Can you check #18 and explain how to do #15 please? 15. Sue ...
Math (Algebra) - The Problem is that 3 people go to lunch. They decide to share ...
psych - Given the following problem: Pretend that you are a bus driver. You ...
Geometry Part 2 - At a track meet,50 people ran the 100- meter dash.2 people ...
maths - number of films seen by a group of people during the past year No of ...
Math - Trail Mix and Number of people A - 27 people B- 33 people Write a ...