Question about Texas Instruments TI-84 Plus Calculator

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Combinations graph My calculator can not use nCr functions in the y= screen. The table of said formula will result in errors and the graph will not appear. This is consistent for using Y= B nCr x and y= B!/(x!(B-x)!) I need to find a way to get a graph and table for the following formula, where every variable can be changed prior to calling it: Y= ((a ^ x ) * ((c-a) ^ (b - x)) / c ^ b) * b nCr x

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You need to follow your user guide for calculaing nCr function

Posted on Nov 16, 2009


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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

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My MS Excel vlookup function ASCII type table contains both upper case and lower case letters, characters like ( and % or *, and numbers. It seems to return the numerical equivalent of upper case letters...

Correct a #N/A error blueup_clv.gifShow All bluedrop_clv.gifHide All This error occurs when a value is not available to a function or formula.
  1. Optionally, click the cell that displays the error, click the button that appears ooui1_za06043871.gif, and then click Show Calculation Steps if it appears.
  2. Review the following possible causes and solutions. blueup_clv.gifMissing data, and #N/A or NA() has been entered in its place
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Oct 31, 2008 | Computers & Internet

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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

1 Answer

When you graph a function,where can I find the table??

I find it easier to generate the table then look at the graph. Here how you go about it, illustrated with screen capture taken from the newer version of the calculator. k24674_7.jpg
Press the MENU button.
Use arrows to highlight the TABLE application (1st screen).
Enter a function expression in Y1=
And press the function key F6 under the TABL menu tab. (2nd screen)
A table is generated (3rd screen)
Press F5 (G-CON) for a connected graph, or F6 (G-PLT) for a dotted graph.
The graph is shown (4th screen).
Use the Zoom function (ZoomAuto) or any other Zoom or change the window dimensions to suit your needs.

Jan 19, 2011 | Casio FX-9750GPlus Calculator

1 Answer

When i enter the binomial probability formula into the casio fx-115es it will not operate. it says that the problem lies in the (n-X)!X! part of the formula. I'm writing everything exactly the way it is in...

You may be writing the expression as they appear in the formula, but the problem stems from the fact the factorial function increase rather rapidly and you cannot calculate the factorials of numbers larger that 69 which is the limit of the calculator.
However if you use the built in Combination function nCr, you will avoid the problem. In the binomial function, the n!/(r!(n-r)!) factor can be replaced by nCr or nC(n-r).

Do not use the explicit form with the factorials because you will get an overflow.

Nov 09, 2010 | Casio FX-115ES Scientific Calculator

3 Answers

Fibonacci formula won't graph, but will show table

Fibonacci sequence is the series of numbers 0, 1, 1, 2, 3, 5, 8, 13, 21, 34, ...
At first type Fibonacci equation in Y editor with condition x>=0 and then graphing it. See captured images with enlarged form of graph




Apr 11, 2010 | Texas Instruments TI-84 Plus Silver...

1 Answer

Some y values in my table say error when i graph logs

That is normal behavior. The log functions are not defined if the argument (x value ) is negative.

Mar 23, 2010 | Texas Instruments TI-83 Plus Calculator

1 Answer

A Committee has 19 members, of which 10 are Democrats and 9 are Republicans. A subcommittee is going to be formed with 3 Democrats and 3 Republicans. How many possible subcommittees can be formed?

How many ways can you select 3 members out of 9 republicans: nCr (9,3)
How many ways can you select 3 members out of 10 democrats: nCr(10,3)
For each single choice of 3 reps you have 1*nCr(10,3) possible subcommittees.
Hence the total number of possible suncommittes is nCr(9,3)*nCr(10,3)
# of possible subcommittees is [9!/(3!*6!)]*[10!/(3!*7!)] or 10080

To calculate you can use the explict formula above or use the nCr function of your calculator

To access the nCr( function press [2nd][5] (MATH) [7:Probability][3:nCr]

You can also just type the name of the command respecting the case ( C must be upper case)

Jan 31, 2010 | Texas Instruments TI-89 Calculator

1 Answer

Graphing Feature error message

This usually happens after the statistical graphs have been used. You should deactivate them. Press [2nd][Y=] (STAT PLOT). Select [4:PlotsOff] [ENTER]. Calculator echoes Done on main screen.
Restart your graphs.

Dec 28, 2009 | Texas Instruments TI-83 Plus Calculator

1 Answer

Binomial function


The binomial probability distribution is defined as
P(r;p;n) =(nCr)(p^r)*(1-p)^(n-r)
where n is the number of trials, p the probability of success, and r the expected result.

Let n=20, r=7, p=0.15 ( I do not know wether this exemple has any meaning in the context of your problem, but you have to enter values that mean something to you. I am only showing you the key strokes

To enter 20C7 you press 20 [SHIFT][nCr]7 ;
To enter 0.15 to the power 7 you type 0.15[X to ] 7 the key is between
[x²] and [log]

To enter (1-0.15) to power 20-7, you type 0.85 [X to] 13
With [*] standing for multiplication key , and [X to] the raise to power key, the exemple above can be entered as

( 20 [SHIFT][nCr] 7) [*] ( 0.15 [X to] 7 ) [*] ( 0.85 [X to] 13 ) [=]

Here is a screen capture to show you what it looks like. However on this calculator the combination 20 [SHIFT][nCr] 7 is represented as nCr(20,7).


Hope it helps

Nov 12, 2009 | Casio FX-115ES Scientific Calculator

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