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New Member
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Aug 2, 2012, 07:08 AM
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probability
How many ways are there to choose a patotoe and two green vegetables form a choice of three potatoes and seven green vegetables
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Uber Member
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Aug 2, 2012, 08:29 AM
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What is your attempt?
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New Member
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Aug 2, 2012, 08:32 AM
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 Originally Posted by unknown008
what is your attempt?
3*7*3
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Uber Member
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Aug 2, 2012, 08:33 AM
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Why did you pick those numbers and multiply them this way?
Note that what you did is not fully right.
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New Member
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Aug 2, 2012, 08:36 AM
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 Originally Posted by Unknown008
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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Uber Member
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Aug 2, 2012, 08:38 AM
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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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New Member
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Aug 2, 2012, 08:40 AM
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 Originally Posted by Unknown008
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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Uber Member
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Aug 2, 2012, 08:44 AM
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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?
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New Member
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Aug 2, 2012, 08:48 AM
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 Originally Posted by Unknown008
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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Uber Member
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Aug 2, 2012, 08:49 AM
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Yup, that's it :)
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