I'm trying to learn Permutations and Combinations in my Algebra class and it gives us generic formulas like nPr=n!over(n-r)! and nCr=n!overr!(n-r)! and I was wondering how I'm supposed to do those. I was also wondering if my calculator could do them. I have a Texas Instruments TI-34II. Can you help me?

go google and type in-- operating instructions for ( make and model of ) calculator
there is a page somewhere that will have a pdf version that you can down load

Look for a key marked nCr for combinations, or one marked with nPr for permutations. The marking may be on the calculator plate. In that case you will use the Shift, 2nd or 2ndF key before.
Enter n, press the key then r.
For the factorial fuction x! or n!, you enter n then press the key. .

Use the "nPr" and "nCr" commands in the MATH PRB menu.

To calculate the permuations of five items taken three at a time, press
5 MATH left-arrow 2 3 ENTER

To calculate the combinations of five items taken three at a time, press
5 MATH left arrow 3 3 ENTER

Your calculator has three keys, next to which are the following markings:n! , nCr, and nPr. The one with the exclamation point is for factorials. The second is for combinations, and the third with permutations.
Syntax of the command.
If the markings are on the keys, the functions are accessed directly. If the markings are on the body of the calculator, you access the functions by pressing SHIFT and the key.

12 [!] gives 12 factorial
12 [nCr] 4 gives the combinations of 12 objects taken 4 at a time (order not important)
12 [nPr] 4 gives the permutations of 12 objects taken 4 at a time (order is important.)

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]

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!

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

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.

You can enter combinations and permutations.

If the order of the selection matters (ie. 1st, 2nd, and 3rd place out of 40 contestants) use permutation. Enter:

40{shift}{nPr}3 and then [=] for your answer set (=59280 possible ways).

IF order doesn not matter (ie. a team of 3 from 40 possible members) then it is a combination. Do the same as above, but substitute {nCr} for {nPr}. (= 9880 possible ways).

For your question: a three-digit set, selecting from 0-9. There is no specified order, it is a combination. The total n=10 (there are 10 digits in the range 0-9) and you are selecting 3.

so.... 10[nCr]3 with give the number of possible combinations.

I can't find it but you can do this:
nCk = (n choose k) = n! / k! / (n-k)!
I don't think there is any other way on this calculator.
Rate me, thanks.