Homework Help

Hello, I am in 6th grade and I am having some trouble with my math homework. Right now,...

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shortrenesmee | Student | eNotes Newbie

Posted May 2, 2013 at 11:09 PM via web

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Hello, I am in 6th grade and I am having some trouble with my math homework. Right now, we are learning about sample spaces. The problems I'm having trouble on are:

1) There are 5 ways to go from Town X to Town Y. There are 3 ways to go from Town Y to Town Z. How many different wys are there to go from Town X to Town Z, passing through Town Y?

and

2) Rasheed has tan pants, black pants, gray pants, and blue pants. He has a brown sweater and a white sweater. How many different ways can he wear a sweater and pants together?

 

Your help will be greatly appreciated!!!

Thank you, NoName (my nickname)

2 Answers | Add Yours

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oldnick | (Level 1) Valedictorian

Posted May 2, 2013 at 11:29 PM (Answer #1)

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`1)` For every way you use to go from X to Y  you can use one of the way to go  from Y to Z so for 5 ways   `X---> Y`  can choice  3 ways 

`Y-------->Z`  for a total of  `3xx5= 15 ways`

`2)`  The reasonement is the same of 1).

Indeed for every pant  you can use one sweater,  since the pants are 3 andthe sweater 2 , then can  use togeter `3xx2=6`  couple 

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violy | High School Teacher | (Level 3) Assistant Educator

Posted May 3, 2013 at 4:43 AM (Answer #2)

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We will apply Fundamental Counting Principles here. When there are m ways to do one thing, and n ways to do another, then there are m×n ways of doing both.

So, for the number of different ways from X to Z we will have:

5*3 = 15 ways


Same principle applies for number 2. 

There are 3 different pants, and 2 different sweaters. 

So, we will have 3 * 2 = 6 ways to wear sweaters and pants together.

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