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Esmy

17C4

  • one year ago
  • one year ago

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  1. ParthKohli
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    \( \color{Black}{\Rightarrow\Large {17! \over (17 - 4)! 4!} }\)

    • one year ago
  2. Esmy
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    |dw:1342190004971:dw| A. 2,380 B. 680 C. 57,120 D. 4,760

    • one year ago
  3. ParthKohli
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    Can you do the rest with a calculator?

    • one year ago
  4. Esmy
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    I got D I'm i right

    • one year ago
  5. ParthKohli
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    \( \color{Black}{\Rightarrow\Large {17 \times 16 \times 15 \times 14 \over 24} }\)

    • one year ago
  6. ParthKohli
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    Let me check it.

    • one year ago
  7. lgbasallote
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    hmm

    • one year ago
  8. ParthKohli
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    Hmm no. But I can explain how I reached that step.

    • one year ago
  9. Esmy
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    17C4 = 17! / ( 4! (17 - 4)! ) 17C4 = ( 17! ) / ( 4! * 13! ) 17C4 = (17 * 16 * 15 * 14) / (4 * 3 * 2 * 1) 17C4 = 2380

    • one year ago
  10. moha_10
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    (17-4)! how to simplify this

    • one year ago
  11. ParthKohli
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    \( \color{Black}{\Rightarrow \Large \binom{17}{4} = {17! \over (17 - 4)! 4!} }\)

    • one year ago
  12. Esmy
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    I got that now :/ ? I'm not sure if I did it right.

    • one year ago
  13. lgbasallote
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    yes you did

    • one year ago
  14. ParthKohli
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    \( \color{Black}{\Rightarrow\Large {17! \over 13!4!} }\)

    • one year ago
  15. lgbasallote
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    amazingly a sciientific calculator already has a function for this lol

    • one year ago
  16. lgbasallote
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    you just have to push buttons =)) but yeah learning this process is better

    • one year ago
  17. Esmy
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    lol okay yeah I was just wondering ^ ^ needed to know my work was good.

    • one year ago
  18. ParthKohli
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    \( \color{Black}{\Rightarrow\Large {\cancel{17!}^{17 \times 16 \times 15 \times 14} \over \cancel{13!}4!} }\)

    • one year ago
  19. lgbasallote
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    it was well

    • one year ago
  20. ParthKohli
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    Yep it was great!

    • one year ago
  21. lgbasallote
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    do you have a scientific calculator though @Esmy ?

    • one year ago
  22. ParthKohli
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    Or http://wolframalpha.com ;)

    • one year ago
  23. Esmy
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    yes.

    • one year ago
  24. lgbasallote
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    you can check your work through that

    • one year ago
  25. ParthKohli
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    I have a Ti - 30XA which is pretty well.

    • one year ago
  26. lgbasallote
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    do you see a function that says \[nCr\]

    • one year ago
  27. ParthKohli
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    But nobody can beat wolfram ♥

    • one year ago
  28. lgbasallote
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    try pressing \[17 \rightarrow nCr \rightarrow 4\] see the magic happen

    • one year ago
  29. ParthKohli
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    You have to press \(17 \Longrightarrow 2nd \Longrightarrow 8 \Longrightarrow 4\) on this one.

    • one year ago
  30. Esmy
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    Oh okay I got it ^ ^ thanks tho for your help.

    • one year ago
  31. lgbasallote
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    dont you mea 2ndF?

    • one year ago
  32. lgbasallote
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    mean*

    • one year ago
  33. ParthKohli
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    You just have to type out 17C4 on Wolfram.

    • one year ago
  34. ParthKohli
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    All scientific calculators differ.

    • one year ago
  35. lgbasallote
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    i've never heard of a function that says 2nd only though

    • one year ago
  36. ParthKohli
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    \(\text{WolframAlpha} > \text{A boring and tedious scientific calculator}\)

    • one year ago
  37. lgbasallote
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    usually it's 2ndF or shift

    • one year ago
  38. lgbasallote
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    bringing calculator > bringing iPad lol

    • one year ago
  39. ParthKohli
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    Typing http://wolframalpha.com > bringing a scientific calculator. :P

    • one year ago
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