Question about Texas Instruments TI-30XA Calculator

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How do I do a factorial problem on a TI-30XA? for example 52!/5!

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Two easy ways.

  1. You can use the factorial function, which is the shifted function of the 3 key. Calculate 52! and divide it by 5!.
  2. You can use the nPr function, which the is the shifted function of the 9 key. 52!/5! is 52 nPr 47 (47 is 52-5).

Posted on Nov 11, 2010

  • 2 more comments 
  • nicolehynes8 Nov 11, 2010

    when i type is in i can't get the right answer

  • kakima Nov 11, 2010

    What do you get when you type in 5 2 2nd [!] / 5 2nd [!] = ?

    What do you get when you type in 5 2 2nd [nPr] 4 7 = ?

  • nicolehynes8 Nov 11, 2010

    6.721514599 to the power of 65. On my answer sheet it says 2,598,960.

  • kakima Nov 11, 2010

    52!/5! is 6.72E65, so the calculator is giving you the correct answer for what you asked of it.

    2598960 happens to be 52 C 5, which is 52! / (5! * 47!). Try this:
    5 2 2nd [!] / 5 2nd [!] / 4 7 2nd [!] = and
    52 nCr 5 =

    Do both of those give you the expected answer?

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