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How do i use the nCr button - Texas Instruments TI-36X Scientific Calculator

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To calculate the number of combinations of n items taken r at a time, enter n, press xy, enter r, then press 3rd [nCr] =. For example, to find the number of possible five-card poker hands, press
5 2 xy 5 3rd [nCr] =

Posted on Jan 27, 2011

  • kakima Jan 27, 2011

    Okay, FixYa is messing up my formating. xy is the x-exchange-y key just below the 2nd key.

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1 Answer

How to find ncr on this calculator


Kimarly, Menu Location. Press: MATH to access the math menu. LEFT to access the PRB submenu. 3 to select nCr, or use arrows.
"I hope this helped you out, if so let me know by pressing the helpful button. Check out some of my other posts if you need more tips and info."
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Where is the combination button on SHARP EL-501W calculator?


There is no such key on this calculator. You can calculate it using factorials. To calculate nCr you can calculate n! / (r! * (n-r)!).

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1 Answer

NCr button


That's because there is no such button. It's in a menu.
If you press the PRB key you'll see a menu which includes nCr as one of the choices.

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1 Answer

NCr + nCr-1 = n+1Cr prove it?


The identity (n+1)Cr=nCr+nC(r-1), valid if n>=1 and 1=0. These facts embody the construction of Pascal's triangle and let you prove by induction (on n) that nCr is always an integer since it's either 1 or it's the sum of two integers.

You can also think of the combinatorial definition of nCr, the number of r-subsets of an n-set. This is definitely an integer. Of course then you'd have to prove that the factorial expression for nCr is correct...


The nCr are binomial coefficients with the property that n+1Cr = nCr-1 + nCr (think of Pascal's Triangle) with nCn = 1 = nC0. Since 0C0 = 1 it follows that all nCr are integers

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1 Answer

When i am trying to do the function... 52 choose 56 (52 2nd nCr 56 =) i keep getting 0.. the nCr button seems to not be working properly


You're getting the correct answer. There are no ways of getting 56 items out of 52. Think about dealing 56 cards out of a deck of 52. It can't be done.

Now, if you want to pick 52 items out of 56, you can press
5 6 2nd nCr 5 2 =
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How to do nPr or nCr on TI-30x Solar (scientific calc.)


If you have an older version on the TI30x Solar (not TI30Xa or newer) then you must use a different key sequence for nPr/nCr.

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1 Answer

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There is no direct or shifted keystroke for nCr nPr and ! on casio long ago.

You can access to those function using OPTN button; here is how to do...

press OPTN, F6(>), F3(PROB), F3(nCr)

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1 Answer

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Firstly you will need NCR Scan Tags. You can download from

http://ncrpr.ncr.com/web/rsdmkt/dealerReady/docs/User_Guides/HighPer_Scanner-User-Guide.pdf

You will have to print out the Scan Tags which start at page 281 and you will also need the correct weights; 0kg, 2.5kg, 5kg and 10kg.

Then follow these steps and be sure to scan tags in correct order:

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Ncr 7167 pcb with feed paper button


WE HAVE PLENTY OF THESE IN STOCK! <-- NCR Technician now Sales Rep... WE CAN REPAIR THIS!

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Mendota Heights MN, 55120

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Give us a call and we can trouble shoot it with you!

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