Results 1 to 2 of 2

Thread: red followed by a yellow

  1. #1
    Mar 2010

    red followed by a yellow

    there are 3 red spaces, 1 blue space, 3 yellow spaces, and one green space for a total of 8 spaces on a spinner. What is the probability of getting a red spin followed by a yellow spin in two spins?

    I am new to probability, so I wanted to check out a couple of my homework questions.

    Here is what I think:
    There are n(s) = 8*8 = 64 possible spins in two total spins
    n(r,y) = 3C1 * 3C1 = 9 possible reds followed by a yellow

    so the probability of spinning a red then yellow in two spins is 9/64???
    Follow Math Help Forum on Facebook and Google+

  2. #2
    Super Member

    May 2006
    Lexington, MA (USA)
    Hello, ihavvaquestion!

    Your reasoning and your answer are both correct!

    Here's another approach . . .

    The probability that the first spin is Red is: $\displaystyle \frac{3}{8}$

    The probability that the second spin is Yellow is: $\displaystyle \frac{3}{8}$

    Therefore: .$\displaystyle P(\text{Red, then Yellow}) \;=\;\frac{3}{8}\cdot\frac{3}{8} \;=\;\frac{9}{64}$

    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. Yellow & Red Cards
    Posted in the Statistics Forum
    Replies: 1
    Last Post: Mar 3rd 2009, 02:58 AM
  2. find area of shaded area (yellow)
    Posted in the Geometry Forum
    Replies: 8
    Last Post: Sep 4th 2007, 08:34 AM

Search Tags

/mathhelpforum @mathhelpforum