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

Kimarly, Menu Location. Press: MATH to access the math menu. LEFT to access the PRB submenu. 3 to select nCr, or use arrows.
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Algebra 1 Using the Graphing Calculator for Probability Functions

How to Enter NCR Questions in TI 83 Plus eHow

Tap and hold the NCR app icon. All the apps will start to "wiggle" and have an "x" mark in the top corner. Tap the "x" on any app you want to uninstall. Hit the home button (the one button the face of the phone) when you are finished.

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.

Press 7 x<>y 4 3rd [nCr]

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

I’m happy to assist further over the phone at https://www.6ya.com/expert/joe_8b8c2cd6ce148309

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 =
and get the answer.

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.

52 [2nd][x/y] 5 [2nd][nCr] gives 2598960 (the x/y button is above the Pi symbol on my version).
8 [2nd][x/y] 3 [2nd][nPr] gives 336

This took me forever to find out, so hopefully it will help someone!

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:

1. Reset
2. Default
3. Program mode
4. Hex 3
5. Hex 0
6. Hex 1
7. Push the calibrate button under weighing tray
8. Place the correct weights in order. It will ask for the weights in order.
9. Calibration complete

i lost my scanner installation disk for model NCR-7837, how can i get it to install?

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