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mathmath333

  • one year ago

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  1. mathmath333
    • one year ago
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    solve \(\large \color{black}{\begin{align} ^{5}P_{r}=^{6}P_{r-1}\hspace{.33em}\\~\\ \end{align}}\)

  2. hartnn
    • one year ago
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    so where are you stuck?

  3. mathmath333
    • one year ago
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    |dw:1439059294486:dw|

  4. hartnn
    • one year ago
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    |dw:1439059398107:dw|

  5. hartnn
    • one year ago
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    |dw:1439059437725:dw|

  6. hartnn
    • one year ago
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    i used the property that \(\huge n! = n(n-1)!\)

  7. mathmath333
    • one year ago
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    i m getting \(r=4,9\)

  8. hartnn
    • one year ago
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    good! :)

  9. mathmath333
    • one year ago
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    but the answer should be only single number

  10. hartnn
    • one year ago
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    but r can't be 4 why?

  11. hartnn
    • one year ago
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    i mean r can't be 9 :P

  12. mathmath333
    • one year ago
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    why???

  13. hartnn
    • one year ago
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    how would you calculate (5-9)! ?

  14. mathmath333
    • one year ago
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    -4!

  15. mathmath333
    • one year ago
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    \(\color{blue}{\text{Originally Posted by}}\) @mathmath333 -4! \(\color{blue}{\text{End of Quote}}\)

  16. mathmath333
    • one year ago
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    hmm this extension works

  17. hartnn
    • one year ago
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    (-4)! factorial of a negative number isn't defined in real plane.

  18. mathmath333
    • one year ago
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    thanks

  19. hartnn
    • one year ago
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    welcome ^_^

  20. mathmath333
    • one year ago
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    \(\color{blue}{\text{Originally Posted by}}\) @hartnn welcome ^_^ \(\color{blue}{\text{End of Quote}}\)

  21. mathmath333
    • one year ago
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    haha this funy quote

  22. hartnn
    • one year ago
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    \(\color{blue}{\text{Originally Posted by}}\) @mathmath333 haha this funy quote \(\color{blue}{\text{End of Quote}}\) indeed

  23. mathmath333
    • one year ago
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    \(\color{blue}{\text{Originally Posted by}}\) @hartnn \(\color{blue}{\text{Originally Posted by}}\) @mathmath333 haha this funy quote \(\color{blue}{\text{End of Quote}}\) indeed \(\color{blue}{\text{End of Quote}}\)

  24. hartnn
    • one year ago
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    quoteception :P

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