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anonymous

  • one year ago

@ganeshie8 How many odd numbers between 50 and 450 can be written as using the digits {0,1,2,3,4,5} ?

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  1. ganeshie8
    • one year ago
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    First consider only the 3 digit numbers : |dw:1439200560957:dw|

  2. ganeshie8
    • one year ago
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    A number is odd when the last digit is any one of \(\{1, 3, 5\}\) so there are exactly 3 ways to fill that last place, yes ?

  3. anonymous
    • one year ago
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    yes

  4. mathmate
    • one year ago
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    So how many ways to fill the middle space? and how many ways to fill the first space?

  5. anonymous
    • one year ago
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    I dont know

  6. ganeshie8
    • one year ago
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    |dw:1439203070936:dw|