# Where is the combination button on SHARP EL-501W calculator?

I am trying to do combinations on my calculator, but I can't find a button to do nCr problems.

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### kakima

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• Sharp Master

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

Posted on Apr 30, 2012

### k24674

Hello,
Use the sequence [2ndF][nPr] for permutations and [2ndF][nCr] for combinations.
Exemples: 10(nPr)3 is entered as 10[2ndF][nPr]3 [=] gives 720
5(nCr)2 is entered as 5 [2ndF][nCr] 2 [=] gives 10

Hope it helps.

Posted on Sep 17, 2009

### Tim Swiercinsky

http://www.sharpusa.com/products/support/view_all_models/0,2326,32,00.html
I don't see that model listed...are you positive on exact model number?

Posted on Sep 05, 2009

### Greg Cann

SOURCE: user's manual Sharp EL-531WH

Posted on Aug 10, 2007

### k24674

Hi,
The source of errors is most certainly due to the wrong schoice of angle unit (degree or radian). If the default angle unit set in your calculator is the degree, any value fed to the trigonometric functions (sin, cos, tan) is considered to be expressed in degrees. Consequently, if you calculate the arctangent ( tan^-1) of a value, the angle returend by that inverse trigonometric function is expressed implicitly in degrees.

Similarly if radian is the default angle unit in your calculator, any angle returned by an inverse trigonometric function (arcos, arcsin, arctan) is in radian.

Set the default angle unit as the one required by your problem at hand. This way, the angles returned will be in the right unit and you will not have a problem of interpretation.

Hope it helps.

Posted on Dec 07, 2009

### k24674

Here, I think I got you a link.

Posted on Jan 30, 2010

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## Related Questions:

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There isn't one. You can access the combination function by pressing the MATH key, selecting PRB, then selecting nCr.

Jun 28, 2014 | Texas Instruments TI-83 Plus Calculator

### How can I calculate combinations with fx-991ES PLUS?

Use nCr (the shifted function of the divide key). For example, to find the number of combinations of five things taken three at a time, press 5 SHIFT nCr 3 = and see 10.

May 03, 2014 | Casio FX991ES Scientific Calculator

### How do i solve this factorial equation? 8!/5!x3!

How to calculate 8!/(5!3!)?
For small numbers (8,5,3) you can use the factorial function key (I will tell you later how to access it) and enter 8! divided by 5!, divided by 3! For numbers greater than or equal to 70 you cannot calculate the factorial: the result is too large for the calculator's memory.

However the formula you wrote is an instance of a combination 8C5 or 8C3 (they have the same value.
Most scientific calculator have three functions: the n Factorial n!, the Combination function nCr and the permutation function nPr.

1. Turn Calculator ON
2. Select the Run icon and press EXE.
3. In Run Screen Press the OPTN key
4. Press F6> to pan to the other tabs
5. Press F3:Prob
The first tab (F1) is marked x!.That is the factorial.
The tab (F2) is marked nPr is for the permutations
The tab (F3) is marked nCr and it corresponds to the combinations.

To use nPr or nCr you enter the larger number n, you press the F key under nPr or nCr. If you press F2 you see a fat P, if you press F3 you see a fat C. Complete by entering the value of r (the smaller number)
If your problem corresponds to Select 8 objects, 5 at a time regardless or order (combinations) you type 8 F3 5 and EXE Result is 56.

Aug 31, 2012 | Casio CFX 9850GA Plus Calculator

### 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.

Mar 25, 2012 | Texas Instruments TI-30 XIIS Calculator

### I can't find the combinations (nCr) button on the fx 9750G11 calculator

In Run screen, enter the number whose factorial you want to calculate ( number can be at most equal to 69), press [OPTN][F6] to get to next page of menus.

For factorials
• Press then [F3](PROB) then [F1] (x!) followed by [EXE].
For combinations
• Press then [F3](PROB) then[F3][nCr][EXE]
For permutations
• Press then [F3](PROB) then[F2][nPr][EXE]

Feb 06, 2011 | Casio FX9750GII Graphic Calculator

### What is the nCr and nPr button for?

nCr is Combination. It calculates the number of ways you can choose r items out of n. For example, 52C5 is the number of possible five-card poker hands you can deal out of a deck of 52 cards.

nPr is Permutation. It calculates the number of ways you can choose r items out of n if the order of selection matters.

Dec 13, 2010 | Sharp ELW516 Scientific Calculator

### How do i use the nCr button

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] =

Sep 09, 2010 | Texas Instruments TI-36X Scientific...

### 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.

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!

Jan 27, 2010 | Texas Instruments TI-84 Plus Silver...

### NPr and nCr key

Hello,
On calculators you calculate permutations and combinations as follows
Enter the number n then press key nPr, and the number r
18(nPr)5=1028160

For combinations, use nCr key instead of nPr.
18(nCr)5=8568.

Hope it helps

Apr 24, 2009 | Texas Instruments BA-II Plus Calculator

### I want to calculate permutation and combination.

Hello,
Use the sequence [2ndF][nPr] for permutations and [2ndF][nCr] for combinations.
Exemples: 10(nPr)3 is entered as 10[2ndF][nPr]3 [=] gives 720
5(nCr)2 is entered as 5 [2ndF][nCr] 2 [=] gives 10

Hope it helps.

Apr 09, 2009 | Sharp EL-531VB Calculator

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