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    snydlite's Avatar
    snydlite Posts: 13, Reputation: 1
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    #1

    Aug 2, 2012, 07:08 AM
    probability
    How many ways are there to choose a patotoe and two green vegetables form a choice of three potatoes and seven green vegetables
    Unknown008's Avatar
    Unknown008 Posts: 8,076, Reputation: 723
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    #2

    Aug 2, 2012, 08:29 AM
    What is your attempt?
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    snydlite Posts: 13, Reputation: 1
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    #3

    Aug 2, 2012, 08:32 AM
    Quote Originally Posted by unknown008 View Post
    what is your attempt?
    3*7*3
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    Unknown008 Posts: 8,076, Reputation: 723
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    #4

    Aug 2, 2012, 08:33 AM
    Why did you pick those numbers and multiply them this way?

    Note that what you did is not fully right.
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    snydlite Posts: 13, Reputation: 1
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    #5

    Aug 2, 2012, 08:36 AM
    Quote Originally Posted by Unknown008 View Post
    Why did you pick those numbers and multiply them this way?

    Note that what you did is not fully right.
    # of slots and items
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    Unknown008 Posts: 8,076, Reputation: 723
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    #6

    Aug 2, 2012, 08:38 AM
    That's not how you do it...

    If I asked you to find the number of ways of picking 3 distinct tomatoes from a group of 10 tomatoes, how many ways are there to pick those 3 tomatoes?
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    snydlite Posts: 13, Reputation: 1
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    #7

    Aug 2, 2012, 08:40 AM
    Quote Originally Posted by Unknown008 View Post
    That's not how you do it...

    If I asked you to find the number of ways of picking 3 distinct tomatoes from a group of 10 tomatoes, how many ways are there to pick those 3 tomatoes?
    Idk
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    Unknown008 Posts: 8,076, Reputation: 723
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    #8

    Aug 2, 2012, 08:44 AM
    I asked you to pick 3 tomatoes.

    You therefore have 3 slots.

    _ _ _

    In the first slot, you can have one of the 10 tomatoes, effectively giving you 10 ways of picking the first tomato.

    10 _ _

    In the second slot, you now have only 9 tomatoes to pick from. Therefore, you have 9 ways of picking the second tomato.

    10 9 _

    With the same logic, you are left with 8 ways.

    10 9 8

    Total number of ways = 10*9*8 = 720 ways.

    Can you try your question now?
    snydlite's Avatar
    snydlite Posts: 13, Reputation: 1
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    #9

    Aug 2, 2012, 08:48 AM
    Quote Originally Posted by Unknown008 View Post
    I asked you to pick 3 tomatoes.

    You therefore have 3 slots.

    _ _ _

    In the first slot, you can have one of the 10 tomatoes, effectively giving you 10 ways of picking the first tomato.

    10 _ _

    In the second slot, you now have only 9 tomatoes to pick from. Therefore, you have 9 ways of picking the second tomato.

    10 9 _

    With the same logic, you are left with 8 ways.

    10 9 8

    Total number of ways = 10*9*8 = 720 ways.

    Can you try your question now?
    Got it ty its 126
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    Unknown008 Posts: 8,076, Reputation: 723
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    #10

    Aug 2, 2012, 08:49 AM
    Yup, that's it :)
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